Touchabb2 PDF

Product Manual
SmarTac/PIB
503 497-502 Standard version/S4Cplus
2001-03-06
Mounting in the robot control cabinet
Framsida
ABB Welding Systems

The information in this document can be subject to change without prior notice and should not
beregarded as an undertaking from ABB Welding Systems AB. ABB Welding Systems AB assumes no
responsibility for errors that can appear in this document.
ABB Welding Systems AB is not responsible for damage incurred by the use of this document or
software or hardware described in this document.
The document, or parts there of, may not be reproduced or copied without prior permission from
ABBWelding Systems AB. It may neither be imparted to another nor otherwise used without
authorization. Infringement here of will be subject to action in accordance with applicable laws.
Further copies of this document can be obtained from ABB Welding Systems AB at current prices.
© ABB Welding Systems AB
Article number: 503 497-502
Date: 2001-03-06
ABB Welding Systems AB
S-695 82 Laxå
Sweden
SmarTac
LIST OF CONTENTS
Page
1 Introduction ................................................................................................................. 5
1.1 Product Overview .............................................................................................. 5
1.2 Operation Overview........................................................................................... 5
1.3 Requirements Overview .................................................................................... 5
1.4 Precautions! ....................................................................................................... 6
2 Technical description .................................................................................................. 7

2.1 General............................................................................................................... 7
2.2 Sensors ............................................................................................................... 8
2.3 Function Description - Searching ...................................................................... 8
2.4 Delivery ............................................................................................................. 9
2.5 Technical Data ................................................................................................... 9
3 Installation ................................................................................................................... 11
3.1 Components List ................................................................................................ 11
3.2 Tools Required ................................................................................................... 11
3.3 Hardware set-up ................................................................................................. 11
3.4 Software set-up .................................................................................................. 11
4 Applications Guide...................................................................................................... 13
4.1 Searching Conditions ......................................................................................... 13
4.2 Programming Limitations .................................................................................. 13
4.3 Signals and Connections .................................................................................... 13
5 User’s Guide................................................................................................................. 15
5.1 Safety ................................................................................................................. 15
5.2 Introduction........................................................................................................ 15
5.3 What is a Frame? ............................................................................................... 16
5.4 Using SmarTac to modify a Displacement Frame. ............................................ 23
5.5 Using SmarTac for Multi-Dimensional Searching. ........................................... 30
5.6 Using SmarTac to Determine Simple Rotational Changes. ............................... 35
5.7 Using SmarTac with Work Object Manipulation............................................... 38
5.8 Search_Part. ....................................................................................................... 44
5.9 Conclusion ......................................................................................................... 45
6 Software Reference...................................................................................................... 47
6.1 Instructions......................................................................................................... 47
503 497-502 3
SmarTac
6.2 Functions ............................................................................................................ 56

6.3 Oframe Module Reference................................................................................. 60
6.4 Mechanical Reference....................................................................................... 61
7 Electrical Reference..................................................................................................... 63
8 Warranty ...................................................................................................................... 65
9 Contacts ........................................................................................................................ 67
10 Glossary ........................................................................................................................ 69
4 503 497-502
SmarTac
Introduction
1 Introduction
1.1 Product Overview

SmarTac is a tactile sensor used to find the location of inconsistent weld joints and
offset the programmed points in a weld program. The main component is an elec-
tronic sensor board, which detects contact with the part feature to be located. The
SmarTac board is supplied as an add-on unit and installed in the robot cabinet. A
RAPID system module, SmarTac.sys, provided by ABB WSD supports powerful
programming tools explained in section 5, “The User’s Guide.” SmarTac search-
ing can be added to programs while programming a part, or it can be added to a
pre-existing weld routine.
1.2 Operation Overview

With SmarTac a part feature may be “searched” using part of the torch. Typically
the welding wire or the gas cup is used as the sensing portion of the torch.
“Searches” are programmed into a weld sequence. Each search consists of two
robtargets; one for the start location and one for the expected location of the part
feature. While searching the torch feature (gas cup or wire) is energized with
about 40VDC. When the torch feature makes contact with the part (at ground
potential) an input is set in the robot controller. When the input is detected, robot
location is stored and motion stops.
The Search instructions included in the SmarTac software are designed to return
“offset”” information. In other words, the result of a search is the distance between
where the original search location was programmed and where the robot has now
found the part.
Using SmarTac effectively can dramatically reduce fixturing costs. It can also help
account for part variability that can not otherwise be controlled.
1.3 Requirements Overview
1.3.1 System Prerequisites

This SmarTac version is intended for use in arc welding systems incorporating IRB
140,1400, 2400, etc. robots.
BaseWare requirements: 4.0 or higher.
Controller requirements: S4Cplus
The SmarTac package includes one system module that is loaded in the foreground
task of the controller. The module, SmarTac.sys, is a stand-alone, read-only, no-
step-in, module. Consequently, it is compatible with any RAPID program, assum-
ing the I/O configuration is correct, and no previous version of SmarTac is loaded
503 497-502 5
SmarTac
Introduction
1.3.2 User’s Qualifications

Any competent robot programmer (S4 RAPID language) may be self-taught to
program and use basic SmarTac searches. Some complex searching techniques are
best reserved for those programmers that have attended an advanced programming
class offered by ABB, unless the programmer has a solid mathematical back-
ground.
For the robotic system operator, the addition of searches is largely transparent and
requires no further training.
1.4 Precautions!
The power supply must always be switched off whenever work is carried out in the
control cabinet.
Circuit boards - printed circuit boards and components - must never be handled
without Electro-Static-Discharge (ESD) protection in order not to damage them.
Use the wrist strap located on the inside of the controller door.
All personnel working with the robot system must be very familiar with the
safety regulations outlined in the chapter on Safety in the robot controller
User's Guide. Incorrect operation can damage the robot or injure someone
6 503 497-502
SmarTac
Technical description
2 Technical description
2.1 General
SmarTac/PIB is a further devel-
opment of the ABB joint search
device SmarTac. Mechanically
and electrically it is integrated
with the ABB welding interface
PIB (Process Interface Board).
The unit has two sensor inputs,
smartac
which can be activated one at a
time or simultaneously.
Figure 1
The unit is a so-called "Add-on"
unit and is connected to the PIB
by way of a 32-pole connector
of the Euro type, see Figure 1.
smartac-pub
)LJXUH
The search properties of SmarTac/PIB are determined by two of the adjustable

parameters, Voltage Valid Limit and Sensor Detection Sensitivity. They are trans-
ferred from the robot together with other PIB configuration data. See Product
Manual, Welding Equipment/S4Cplus for Configuration Parameters.
The search properties can thereby be adapted to the existing circumstances of the
search circuit.
503 497-502 7
SmarTac
2.2 Sensors
In the welding system A314/A324 containing PIB, the input for sensor 1 is con-
nected to the gas cup of the welding gun, whereas sensor input 2 is connected to
the welding nozzle for searching by way of the welding wire.
Using sensor 2 it is usually necessary to disconnect the welding circuit to avoid
current divertion through the power source resulting in too low search voltage.
Searching with sensor 2 is only used for special applications.
2.3 Function Description - Searching

The search of the joint is usually done using a search routine in the robot program.
The following description assumes that the ABB Flexible Automation signal
names and robot configuration apply.
In deliveries containing SmarTac, programs for the search routine and configura-
tion parameters are pre-loaded. When SmarTac is delivered as an option, a diskette
containing the corresponding data comes with the delivery.
Note.
Although the pre-loaded configuration parameters for SmarTac in most cases fit, a
change may be needed for the actual application. The procedure for this is the same
as for all configuration parameters in PIB. See Product Manual, Welding Equip-
ment/S4Cplus.
In the event the configuration parameters must be modified, the same conditions
apply as for PIB. See the section Configuration.
Activating the Sensor (Sensor 1)

The sensor is activated by a message from the robot to the PIB, doSE1_SEL=1,
applying the search voltage to the gas cup of the welding gun.
The search voltage connected between the gas cup and the object to be searched is
generated by a voltage source galvanically separated from other current circuits.
Checking the Sensor (Voltage Valid Limit)

When a sensor is activated the search voltage will depend on the insulating proper-
ties of the open search circuit.
Low insulation value between the sensor and the parts having electrical contact
with the object to be searched will reduce the search voltage, due to for example
the passage of current through the water when a water-cooled welding gun is used,
soot formation, etc.
Increased contact resistance due to oxide layers, oil film, soot, etc. in combination
with decreased search voltage makes it more difficult to achieve reliable contact
between the sensor and the search object.
Using the adjustable parameter Voltage Valid Limit a level can be set under which
the search shall not continue.
Configuration range: 0 – 40V in steps of 1V.
Preconfigured value: 8
8 503 497-502
SmarTac
If the present search voltage is higher than the Voltage Valid Limit, the message
diSe_Valid=1 will be sent from the PIB to the robot giving the robot the signal for
carrying on the search.
Sensitivity (Sensor Detection Sensitivity)

The adjustable parameter Sensor Detection Sens determines the sensitivity of the
sensor. Configuration range: 0-10V in steps of 0.1V.
The SmarTac trigger level is locked by the message doSE_REF=1 from the robot
according to the following:
Trigger level = the present search voltage - the Sensor Detection Sens value.
Under normal conditions reliable search is achieved using values > = 1V.
Preconfigured value: 10
Detection
When during the search the gas cup gets into contact with the search object the
sensor input is exposed to voltage drop.
If the voltage drops below the trigger level the PIB will send the search stop mes-
sage diSE1_DET=1 to the robot, and the co-ordinates of the search object can be
registered.
2.4 Delivery
SmarTac is delivered as SmarTac complete, article no. 503500-880, consisting of:
- SmarTac unit
- Software, contained in the system diskette when a complete system is
delivered, and in a separate diskette when SmarTac is delivered sepa-
rately
- User’s Guide with program description and examples.
2.5 Technical Data

Accuracy: Max. deviation ± 0.25 mm at a search speed of 20 mm/sec.
Marking: See Figure 3.
Mechanical Data
Weight: 0.220 kg
Dimensions: 22x65x185 mm (see Figure 3)
Enclosure class: IP 20.
Electrical Data:
Max. serach voltage: 40V
Max. search current: 4.3 mA.
Environmental data: See point 6.16.3
503 497-502 9
SmarTac
185 mm
65
53
Delivery data Product number Version number
ABB
xxxxxxx-xxxx
xxxxxxx xxxxxx
22
503400A1
15
Serial number Date of testing

10
ABB rituals nummer
Figure 3
10 503 497-502
SmarTac
Installation
3 Installation
3.1 Components List

The following items are supplied with the SmarTac option:
• SmarTac “Add on” unit.
• SmarTac.sys RAPID system module.
• Relevant electrical schematics.
3.2 Tools Required

The following tools are required to install the SmarTac option:
• Torx screwdriver.
3.3 Hardware set-up
3.3.1 SmarTac Board Installation
1. Turn off incoming power to S4Cplus controller.
2. When handling the SmarTac board, avoid electrical discharge damage by

wearing a grounding wrist strap or similar Electro-Static-Discharge (ESD)
protection.
3. Install the SmarTac “Add on” unit on the PIB, see Figure 2.
3.4 Software set-up
3.4.1 Compatibility
This SmarTac version is intended for use in arc welding systems incorporating IRB
140,1400, 2400, etc. robots.
BaseWare requirements: 4.0 or higher.
Controller requirements: S4Cplus
The SmarTac package includes one system module that is loaded in the foreground
task of the controller. The module, SmarTac.sys, is a stand-alone, read-only, no-
step-in, module. Consequently, it is compatible with any RAPID program, assum-
ing the I/O configuration is non-conflicting
503 497-502 11
SmarTac
Installation
3.4.2 System Parameters
Board Channel Designation Association
B_PROC_30 Input Ch 10 diSE_VALID SmarTac
B_PROC_30 Output Ch 12 doSE1_SEL SmarTac
B_PROC_30 Output Ch 14 doSE_REF SmarTac
B_PROC_30 Output Ch 7 diSE1_DET SmarTac
3.4.3 Loading Software
1. The software will be loaded together with the robot aw configuration option
“3HEA 50385088”.
12 503 497-502
SmarTac
Applications Guide
4 Applications Guide
4.1 Searching Conditions

SmarTac is intended for use in the following conditions:
• In applications where surfaces are free from rust, mill scale, paint, or other
electrically-insulating layer or coating.
• If the gas nozzle is used for a search probe, it must be cleaned at regular
intervals.
• If a water-cooled torch is used, the quality of the cooling water is very
important. Impure water, e.g. containing salt solution, will act as a load that
will reduce the sensitivity and/or reduce the sensing voltage below SmarTac
working range. Distilled water or a non-conductive coolant such as ethylene
glycol is recommended as gun coolant solution. “Tap” water is unaccepta-
ble.
4.2 Programming Limitations

The use of searches ranges from very simplistic to very complex. In some
instances, very complex searching techniques must be used to adequately deter-
mine weld seam locations. In such instances, assistance from an experienced ABB
technician may be required.
4.3 Signals and Connections

SmarTac is operated by signals from the robot. Signals and connections are
described below.
SmarTac I/O:
There are 4 I/O signals used by SmarTac.
diSE_DET Input used for surface detection.

diSE_VALID Input used for validation of the search voltage.
doSE_REF Output used to set the sensing reference voltage.
doSE1_SEL Output used to set the search detection signal.
503 497-502 13
SmarTac
Applications Guide
4.3.1 I/O Timeline
6,*1$/6($5&+,1,76($5&+67$57&217$&7:3$576($5&+(1'
'R6(B6(/
LISUHVHQW
GL6(B'(7
GL6(B9$/,'
GR6(B5()
14 503 497-502
SmarTac
User’s Guide
5 User’s Guide
5.1 Safety
Failure to follow safety guidelines presented throughout this manual can
result in property damage, serious injury, or death!
Consequently, the control cabinet door(s) should always be closed when the con-
trol cabinet is turned on. Only qualified technicians should ever attempt trouble
shooting.
The SmarTac sensing voltage applied at the torch when searching is supplied by a
40VDC, low current source. This sensing current is harmless.
The programmer must take all safety precautions presented in the Robot Control-
ler’s User’s Guide while operating the robotic system.
5.2 Introduction
The SmarTac system available from ABB Flexible automation, is a very versatile
tool for accurately locating weld seams. The system module, SmarTac.sys,
included in the package, contains useful search instructions that simplify the pro-
gramming. The module also includes mathematical functions that are useful in
advanced searching techniques. All of these are discussed in this section.
Before tactile searching can be used effectively, you need to be able to answer
these questions:
1. How do my parts deviate?

Knowing where the parts move, and where they don’t is critical for determining
what features to search. Searching takes time. Unnecessary searches increase cycle
time and programming complexity. In this manual, the simplest cases will be han-
dled first. In many cases these techniques will be enough. In some situations where
part fit-up and/or fixtures is poor, you’ll need to understand all the tricks described
in the manual.
2. What is a frame?
A good understanding of work objects and displacement frames is the key to suc-
cessful programming with SmarTac searching. This guide will start with a discus-
sion of these important elements. As the programming examples in the guide
become more complex, this topic will be further elaborated on.
3. What are the RAPID instructions and how are they used to manipulate my
weld routines?
503 497-502 15
SmarTac
User’s Guide
In this guide we will look at several search techniques and the instructions
required. Detailed examples will be provided for each of these. Plus the appendi-
ces, SmarTac Instructions and SmarTac Functions, provide detailed explanations
of the instructions and functions included with the SmarTac software.
5.3 What is a Frame?

The ABB controller utilizes a number of frames to describe the relationship of the
robot tool to the world. The following is a very brief synopsis of what is described
in the S4 Robot Controller User’s Guide. The next page or so may be difficult to
understand at first. Don’t worry about it. The exercises later on will help to solidify
your understanding of these concepts.
Frames are coordinate systems. In the robot controller, frames are described by
location and orientation. The location of a frame is defined by three dimensions, x,
y, and z. These three dimensions dictate where the origin of the frame is located.
The orientation of a frame is described by four quaternions.
Frames are used in tool definitions, tooldata, robot targets, robtargets, work object
definitions, wobjdata, and program displacement definitions, pose. The tool frame
definition describes how the Tool Center Point (TCP) is related to the end of the
robot arm, which is related to the world frame through the base of the robot. A rob-
target is related to a program displacement frame, which is related to the object
frame of a work object, which is related to the user frame of the work object,
which is related to the world frame. Take a look at this figure from the Robot Con-
troller User’s Guide:
Figure 4.
In the figure, P1 is a robtarget frame. Pdisp is the current program displacement

frame. Object is the object frame of the current work object. User is the user frame
of the current work object. (Note: Work objects have two frames: object and user.)
World is the frame that all the other frames are related to in one way or another.
The Robot base is defined as the baseframe of the robot.
16 503 497-502
SmarTac
User’s Guide
In the figure above, if any of the frames are changed, the relationship of the TCP to
the robtarget changes. If the user frame of the work object is changed by 10mm in
‘X’, in relation to the World frame, then the robtarget will move 10mm in ‘X’, in
relation to the World frame. If the program displacement is changed by 10mm in
‘X’, in relation to the object frame, then the robtarget will move 10mm in ‘X’, in
relation to the object frame.
5.3.1 Exercise 1 Program Displacement

This exercise demonstrates how a program displacement works. The exercises
later in this guide will not be as detailed as this one. Please take the time to under-
stand this exercise before attempting others.
If the SmarTac module has not been loaded, instructions are found in the Installa-
tion and Maintenance section of this manual. All exercises assume that the
SmarTac software and hardware is installed and working properly.
1. Create a new program module to work in. Call it “ST_TEST”. Consult the
Controller User’s Guide if you need help.
2. Create a new routine in that module and call it “disp_ex1”.
3. If not already done, define the tool using the five point method or Bullseye.
Call the tool “tWeldGun”. Consult the Controller User’s Guide, or Bullseye
manual if you need help.
Tip: To make programming easier you may want to add in these commands into
one of your “Most Common” pick lists:
PDispAdd
PDispOff
PDispSet
Search_1D
Search_Groove
Search_Part
4. Tape a piece of paper to a table, or similar surface, within the robot’s reach.
On the paper draw a rectangle. (Perfection is not required here.)
5. View the modules, select the new module, “ST_TEST”, and select the new
routine, “disp_ex1”.
503 497-502 17
SmarTac
User’s Guide
6. Jog the robot so that the torch is pointing at the rectangle you drew. The tip
of the torch should be a few inches above the rectangle. Create a MoveJ at
this point using tWeldGun and no work object selected:
7. Now insert the instruction, PDispSet. This is a RAPID command that will
be found on one of the standard instruction pick-lists. Here, you will see
that we used a custom “Most Common” pick-list. The PDispSet instruction
requires one argument: a Displacement Frame. When prompted for this
data, select new… and create a new pose data type called “peEX1”:
8. Now jog the robot down to the rectangle so that the tip is just above one of
the rectangle corners. Create a MoveL at this position using tWeldGun and
no work object selected.
9. Do the same for the rest of the corners, returning to the first corner, so that
you have a short program that traces out the rectangle:
18 503 497-502
SmarTac
User’s Guide
10. Now insert the instruction: PDispOff.
11. Jog the robot away from the rectangle a few inches and insert a final
MoveL:
12. Execute this routine from the beginning in manual mode to be sure the
program works correctly. The path should look something like this:
503 497-502 19
SmarTac
User’s Guide
This routine executes a simple movement path. Each of the robtargets in the
MoveL instructions is related to the World frame through the chain of frames dis-
cussed earlier. In this case, however, the work object has not been specified, so
wobj0 is used by default. This work object is the same as the world frame.
13. Take a look at the values in wobj0 by selecting View and “Data Types”.
Then choose wobjdata off the list. The list of work objects defined in the
system is shown:
14. Highlight wobj0 and hit enter. The following will be visible:
20 503 497-502
SmarTac
User’s Guide
Cursor down and look at the data that is present. Note that a work object has two
frames, the user frame, uframe, and the object frame, oframe. Also note that the
values are all zero for the locations, and ones and zeros for the orientations. That’s
why the work object has no affect on our program. It is the same as the World
frame.
The only other frame that can change the robtarget positions in our “rectangle”
routine, is the Displacement Frame.
15. Hit “Cancel” to get out of the work object window. Then hit “test” to
return to the test screen.
16. Move the cursor to the PDispSet instruction, and over to the argument,
peEX1. Only peEX1 should be highlighted.
17. View the data in peEX1 by selecting “Edit” and “value”:
503 497-502 21
SmarTac
User’s Guide
A screen will appear showing the values present in this data type, pose. (Note: This
feature works for all data types.) X, Y, and Z will all be zero. This displacement
frame did not alter the rectangle program at all.
18. Move the cursor to the Y value and change the number to 15:
19. Hit OK and run the routine, disp_ex1, again.

What happens? The moves are shifted 15mm in the positive Y direction. That’s
15mm in Y relative to the work object object frame. And, as discussed earlier, the
object frame and user frame in wobj0 are the same as the world frame. So the rec-
tangle moved 15mm relative to the world, as well.
This is what Program Displacement Frames do. A change in the displacement
frame changes the location of the robtargets. Displacement Frames can be turned
on and off using PDispSet and PDispOff. Similarly, changes in the work object will
move the robtargets as well (Work object manipulation will be discussed later).
Try making other changes in X, Y, and Z of peEX1. Remember, positive Z will
move the rectangle up. Don’t use a negative Z, or you’ll crash the tool. Use the
technique described in step #17.
Important: Do not make changes to the four quaternions, q1…q4. If quaternions
are changed manually, errors could occur. Quaternions must be normal-
ized, so it is not possible to choose numbers randomly. This will be dis-
cussed later.
Advanced: Look at the robtarget data using the same technique described in step
#17 for looking at pose data. Notice that the robtarget data does not
change when the rectangle is moved using the displacement frame. Do
you understand why?
22 503 497-502
SmarTac
User’s Guide
5.4 Using SmarTac to modify a Displacement Frame.

SmarTac programming tools provide a simple way to search a part feature and
apply the search results to a program displacement frame. As Exercise 1 demon-
strated, using program displacements is an easy way of shifting programmed rob-
targets. The most basic search is a one-dimensional search. A 1-D search finds an
offset in one direction.
Search_1D is an instruction that is included in the SmarTac system module. Of the
three search instructions included in the module, this is the most common. It is use-
ful in a variety of situations and will be present in most of the exercises and exam-
ples from this point on.
The Search_1D instruction has the following structure:
Search_1D peOffset,p1,p2,v200,tWeldGun;
Search_1D has five required arguments:
Argument Example Name Data Type
1. Result peOffset pose
2. StartPoint p1 robtarget
3. SearchPoint p2 robtarget
4. Speed v200 speeddata
5. Tool tWeldGun tooldata
When executed, the robot makes an ‘L’ move to the StartPoint, ‘p1’. The TCP
velocity described in Speed determines the speed of this first move. The SmarTac
board is activated and motion starts towards the SearchPoint, ‘p2’. The robot will
continue past the search point for a total search distance described by twice the dis-
tance between StartPoint and SearchPoint, or until the part feature is sensed. Once
the part feature is sensed, motion stops, and the displacement data, Result, is
stored.
Figure 5.
503 497-502 23
SmarTac
User’s Guide
Figure 6.
The StartPoint and SearchPoint are programmed. The two points determine the
direction of the search. The SearchPoint is programmed so the torch is touching
the part feature. The Result is the difference between the programmed SearchPoint,
and the actual SearchStop that is found when a different part is present.
Figure 7.
The following exercise demonstrates the instruction, Search_1D.
5.4.1 Exercise 2 One Dimensional Search

For this exercise the movement routine used in Exercise 1 is used. If you did not
complete Exercise 1, you will need to write a similar routine.
24 503 497-502
SmarTac
User’s Guide
1. View the routines in the module “ST_TEST”.
2. Highlight “disp_ex1” and hit the key marked Dupl… at the bottom of the
teach pendant screen. The controller will offer the default routine name,
“disp_ex2”. Accept this, then look at the instructions in the new routine:
3. Remove the paper with the rectangle drawn on it.
4. Place a metal plate on the table so that a portion of the plate is overhanging:
Figure 8. “Top View”
5. Edit the values in peEX1 so that X, Y, and Z equal zero.
6. Move the Program Pointer to the new routine and toggle the Program Win-
dow to test mode.
503 497-502 25
SmarTac
User’s Guide
7. Step through the rectangle program and modify each of the points so that
they correspond to each of the plate’s corners.
8. Continue to step though the routine until the Program Pointer loops back to
the beginning.
9. Toggle the Program Window to instruction mode. If a “Most Common”

pick-list with SmarTac instructions was created, select it.
10. Move the cursor to the first line, MoveJ. Using the Copy and Paste keys at
the bottom of the screen, copy the MoveJ and paste it right below it:
Between the two MoveJ instructions we will be adding more moves and a search
instruction. The search will collect information about the location of the plate, and
store the information in peEX1. Our plate-tracing movements will then be shifted
accordingly.
11. Jog the robot torch so that it is above and past the edge of the plate. Insert
a MoveL instruction for this location between the two MoveJ instructions.
26 503 497-502
SmarTac
User’s Guide
Figure 9.
12. Insert the instruction, Search_1D, after the MoveL. (If no “Most Com-
mon” pick-list was created, use ProcCall to find the instruction. When
prompted for data, use this data:
Search_1D peEX1,*,*,v200,tWeldGun;
The routine should look like this:
13. Jog the robot to the SearchPoint and “ModPos” the second robtarget in
the Search_1D instruction. The gas cup should make contact with the
plate without deflecting the torch.
14. Jog the robot to the StartPoint and “ModPos” the first robtarget in the
Search_1D instruction.
503 497-502 27
SmarTac
User’s Guide
Figure 10.
Figure 11. “Top View”
15. Toggle the Program Window to the test mode and move the Program
Pointer to the Search_1D instruction.
16. Enable the robot and hit the Fwd key. The robot should move to the
StartPoint, then search towards the SearchPoint, until the plate is
detected. (See Figure ex2.c)
17. Toggle the Program Window to instruction mode and using the Copy and
Paste keys, copy the MoveL ahead of the Search_1D and paste it after the
Search_1D. Your final routine, disp_ex2, should look like this:
28 503 497-502
SmarTac
User’s Guide
PROC disp_ex2()
MoveJ *,v200,fine,tWeldGun;
MoveL *,v200,fine,tWeldGun;
PDispSet peEX1;
PDispOff;
ENDPROC
18. Run the routine from the beginning. The torch should search the plate
and then trace out the plate.
19. Move the plate about 10mm away from the SearchPoint and try running
the routine (See Figure ex2.e). If the plate was moved in the direction of
the search, without any rotation, the torch should still trace out the plate
correctly.
Figure 12.
Questions:
1. Look at the data in peEX1. How does it change after searching different
locations?
2. What happens when the plate is moved in other directions?

Advanced:
3. What happens when the search is programmed so that the search direction is
not perpendicular to the plate’s edge?
4. What errors occur when the plate is moved too far away? Experiment with
503 497-502 29
SmarTac
User’s Guide
the error recovery options to see what they do. Consult Section 8.1 “Instruc-
tions” in this manual to see detailed explanations of the error handing capa-
bilities.
5.4.2 Programming Tips
1. Remember that the direction of the search dictates the direction that the
resulting program displacement can shift a program.
2. You should almost always search perpendicular to the part feature surface.
The search accuracy will suffer if the search direction is at an angle to the
feature surface.
3. For a newly programmed search try executing the search using the Forward
Step key. When the robot stops motion with the torch touching the part,
move the cursor to the SearchPoint and “mod-pos” the robtarget. This
ensures that a search on a “perfect” part will return a displacement that is
very close to zero.
5.5 Using SmarTac for Multi-Dimensional Searching.

As seen in Example 2, a one-dimensional search will determine where a weld seam
is if it is constrained to move in only one direction. In some cases this is adequate.
More likely, though, a two or three-dimensional search is required. A two-dimen-
sional search would provide information about where a plate is located on a table,
for example. A three-dimensional search would also determine how high the table
surface was.
In Example 2 you may have noticed that if the plate was rotated when moved, the
Displacement Frame would not compensate for the rotation. This is the limitation
of single and multi-dimensional searching. These search techniques are relatively
easy to master and, despite the limitation, provide accurate search information
about the weld seam when used correctly.
To search a part in more than one direction, a combination of one-dimensional
searches is used and the result of each search is added together. Example 3 demon-
strates this for a two-dimensional search.
5.5.1 Exercise 3 Two Dimensional Search

In this exercise the Search_1D instruction will be used twice to determine a two-
dimensional shift in a plate on a table.
1. View the routines in the module, ST_TEST.
2. Highlight disp_ex2 and duplicate it. Name the new routine disp_ex3.
3. Toggle the Program Window to test mode.
4. Move the Program Pointer to the new procedure, disp_ex3.
30 503 497-502
SmarTac
User’s Guide
5. Move the Program Pointer to the PDispOff instruction near the end of the
routine.
6. Enable the robot and step forward once to execute this instruction.
7. Make sure the robot can move to the first MoveL that traces out the plate,
then move the Program Pointer to this MoveL.
8. Enable the robot and step forward once. Align the plate to the torch tip.
Step though the rest of the points to get the plate back to where it was when
we first wrote the routine.
9. Move the cursor to the top of the routine, enable the robot, and step forward
until the search is complete, and the robot stops at the MoveL immediately
following the Search_1D instruction.
10. Add another MoveL here. Its location should be off the end of the plate. You
are going to add another search to this routine that will search the end of the
plate. This move will provide safe passage.
11. Copy the last Search_1D and insert it after the MoveL created in step #9.
12. Copy the MoveL created in step #9 and insert it after the last Search_1D.
13. The routine should now look like this:

PROC disp_ex3()
MoveL *,v200,fine,tWeldGun; Ì New MoveL from step #9
Search_1D peEX1,*,*,v200,tWeldGun; Ì New Search_1D
MoveL *,v200,fine,tWeldGun; Ì Copy of MoveL from step #9
PDispSet peEX1;
PDispOff;
ENDPROC
14. Modify the robtargets in the new Search_1D to search the end of the plate.
The new search will be referred to as “search 2”:
503 497-502 31
SmarTac
User’s Guide
Figure 13.
15. Highlight the second Search_1D instruction. And hit the Enter key.
16. Press the OptArg key to look at the optional arguments.
17. Move the cursor down to the optional argument named, [\PrePDisp], and
Add it.
18. Select OK.
19. Move the cursor to the new argument and hit enter:
32 503 497-502
SmarTac
User’s Guide
20. From the list of available pose data select peEX1. Press OK. The routine
should look like this:
PROC disp_ex3()
Search_1D peEX1,*,*,v200,tWeldGun\PrePDisp:=peEX1;
PDispSet peEX1;
PDispOff;
ENDPROC
21. Jog the torch so that it is above the plate and execute the routine from the
beginning. The torch should trace out the plate.
22. Move the plate about 10mm in any direction and re-execute the routine. The
torch should trace out the plate.
Questions:
1. Why is it necessary that the PrePDisp be set to peEX1 in this example?

What happens when a different displacement frame (other than peEX1) is
used in the first Search_1D?
2. What happens when this optional argument in the second Search_1D is not
present?
3. Two and three-dimensional searches should almost always use search direc-
503 497-502 33
SmarTac
User’s Guide
tions that are perpendicular to one another. Why?

Advanced:
4. What happens when the plate is rotated slightly? Why?
5. Add the optional argument, [\NotOff], to the first search instruction. And
execute the program. What does this do? Hint: Look at the Search_1D sec-
tion of section 8.1, “Instructions”.
6. What would happen if the [\NotOff] argument was added to the second
search and the next section of the routine had a welding instruction? Hint:
Look in section 8.1.
7. Version 7.0 only: Why must there always be at least one Move instruction
between two searches? Hint: What happens when SmarTac is activated
while the torch is touching the part?
8. If there is time try to write a three-dimensional search. Do not corrupt

disp_ex3, as it will be used later. The 3-D search should look something
like this:
PROC disp_ex3_3D()
PDispSet peEX1;
PDispOff;
ENDPROC
Your routine may have more or less moves to re-orient the torch when searching in
the vertical direction:
34 503 497-502
SmarTac
User’s Guide
Figure 14.
9. In Example 1, what happens if you search the same edge twice, using PreP-
Disp to add the second search result to the first?
5.6 Using SmarTac to Determine Simple Rotational Changes.

Up to this point basic one dimensional searches have been used to accurately locate
part features that have moved in only in translation, not rotation:
X’
X P2
displaced
P2
Robtargets shifted
Original robtarget by Program
positions Displacement
P3
P3 displaced
Y’
Y
Shift described by
Program Displacement
Using this same basic concept, it is possible to search a weld seam that moves both
in translation and rotation. Imagine that the robtargets in the above sketch, P2 and
P3, describe the ArcL\On and ArcL\Off of a weld. If each robtarget is represented
by a different Program Displacement then the weld seam can be moved rotation-
ally as well:
503 497-502 35
SmarTac
User’s Guide
X X
Robtargets shifted
Original robtarget by Program
positions Displacements
P2
Y P2 Y
X displaced
X
P3
Y
Y P3 displaced
To do this for a real weld seam, the robtargets, P2 and P3, will have to be searched
separately and the displacement data stored in two different pose data elements.
Example 4 illustrates this technique.
5.6.1 Exercise 4 Part feature with simple rotation.

In this example a simple path with two points will be moved in translation as well
as in rotation.
1. Create a new routine called, disp_ex4, that looks like this:

PROC disp_ex4()
Search_1D peEX1,*,*,v200,tWeldGun; ÌSearch 1
Search_1D peEX2,*,*,v200,tWeldGun\PrePDisp:=peEX1; ÌSearch 2
Search_1D peEX3,*,*,v200,tWeldGun\PrePDisp:=peEX1; ÌSearch 3
PDispSet peEX2;
MoveL P1,v200,fine,tWeldGun; ÌCorner 1
PDispSet peEX3;
MoveL P2,v20,fine,tWeldGun; ÌCorner 2
PDispOff;
ENDPROC
Three displacement frames will be used, peEX1, peEX2, and peEX3. You will
need to create these if they do not exist in the system. Be careful that the correct
per-displacement is called for each search instruction.
The searches should look similar to those used in Example 2 & 3 (See Figure
ex2.c), but positioned around the plate like this:
36 503 497-502
SmarTac
User’s Guide
Figure 15.
For the best accuracy, put searches near the corners.
2. Modify P1 and P2 to be at the corners of the plate, as shown above. You

will have to create the named robtargets, P1 and P2, if they do not exist in
the system. It is not necessary that these two points be named for the test to
work. They are named here as a teaching aid only.
3. Modify the “air moves” to clear the plate.
4. Step through the routine to check the positions. If P1 and P2 are out of posi-
tion, you can jog them into position and mod-pos them with the program
displacement turned on.
5. Execute the program from the beginning. And watch the robot trace the
edge of the plate.
6. Move the plate in various directions, including rotationally, and execute the
routine each time. Does the robot torch follow edge each time? If it does
not, there check the program again to be sure all the correct displacement
frames are in the right places.
Questions:
1. How is the usage of PrePDisp different from that in Example 3?
2. Look at the values in each of the program displacements, peEX1, peEX2,

and peEX3. What the values for the rotation portions, q1…q4?
Advanced:
3. When the plate is rotated significantly, do you see any error in the position-
ing of P1 and P2? Why will large rotations of the plate cause some error in
this example?
4. Why would it be difficult to shift an intermittent “stitch” weld in this way?
503 497-502 37
SmarTac
User’s Guide
5.7 Using SmarTac with Work Object Manipulation.

Sometimes using multiple displacement frames can not provide an easy way of
determining a weld seam’s location. In Example 4 we proved that a simple weld
path could be moved in translation and rotation using two displacement frames;
one for the start and one for the end of the weld path. If the weld were not continu-
ous, i.e. a stitch weld, this would not work. There is no displacement information
about the intermediate weld points.
In some instances it is necessary to determine how the whole part has moved in
translation and rotation. The best way to do this is to use a work object to describe
where the part is in relation to the world frame. Based on search information, the
object frame of a work object can be moved in translation and rotation. If the weld
sequence in written in this work object, the points in the sequence will move with
changes to the work object.
P1
X
displaced
P2
X (reference) displaced
RefP1
RefP2
New work object

Reference work
object P3
displaced
RefP3 Y
Y (reference)
An important benefit to this technique is that searching and program displacements

can still be used for features on the part after the part program has been rotated in
the work object.
X
X (reference)
RefP1 X
RefP2
Y P2
displaced
Reference work Y
P1
object displaced
New work object
RefP3
P3
displaced
Y (reference)
Y
In this image, robtargets P1, P2, and P3 all move with the work object. In addition,
P1 moves with a program displacement frame relative to that work object.
The SmarTac module contains two mathematical functions that can be used in con-
junction with the Search_1D instruction to make this searching technique easier.
38 503 497-502
SmarTac
User’s Guide
5.7.1 SmarTac Functions

Two global mathematical functions are provided in the SmarTac module:
PoseAdd
OFrameChange
PoseAdd is a simple function used to add the trans portion of two or three displace-
ment frames. The function returns pose data. In use it looks like this:
peSUM:=PoseAdd(peFIRST,peSECOND);
Using PoseAdd is similar to using the optional argument PrePDisp in a
Search_1D.
The second function is OFrameChange. This function uses seven arguments, a ref-
erence work object, three reference points, and three displacement frames. The
function returns wobjdata. In use it looks like this:
obNEW:=OFrameChange(obREF, p1,p2,p3,pe1,pe2,pe3);
Detailed explanations of each of these functions can be found in section 8.2,
“Functions.”
Exercise 5 will illustrate the usage of these mathematical tools.
5.7.2 Exercise 5 Object Frame Manipulation.

In this exercise a two dimensional example will be used, as in Exercise 4. There
will be four searches for this technique, so the plate will have to be clamped so that
most of the plate is off the table:
Figure 16.
Refer to this sketch when laying out the points for this exercise:
503 497-502 39
SmarTac
User’s Guide
p2 pe2a
1.Load the program module,
“OFrame”, from the provided
disk. The disk has been pro-
vided to speed up this exercise.
If you don’t have the disk, you
will have to write the routines
from scratch using the teach
pendant. A printout can be
found in section 8.3 of this
manual.
2.View the routines in the mod-

ule. You should see the follow-
ing routines:
p3 p1
pe1b
pe3a pe1a
Figure 17.
3. Mark three points on the surface of the plate and label them p1, p2, and p3.
The location of the points is not critical, but they should be near the corners
as shown in Figure ex5.b & ex5.c.
4. Move the program pointer to the procedure called, “RefPoints”. RefPoints

is a routine that, once updated, will point out the three reference points.
40 503 497-502
SmarTac
User’s Guide
5. Execute the instruction: PDispOff at the beginning of the procedure using

the Forward Step key. (This ensures that no displacements are active.)
6. Jog the robot so that the torch is situated about 150mm above the plate sur-
face and pointing down at the plate.
7. Move the cursor to the first MoveJ and modify the position. You may have
to change your settings in the Jog Window to reflect the work object
change.
8. Jog the robot so that the torch TCP is just touching the p1 mark, and modify
the second MoveL: MoveL p1,v200,fine,tWeldGun\WObj:=obREF;
9. Jog the robot to the p2 mark and modify the MoveL: MoveL p2,v200…
10. Jog the robot to the p3 mark and modify the MoveL: MoveL p3,v200…
11. Jog the robot so the torch is about 150mm above the plate and modify the
last MoveJ.
12. Move the Program Pointer to the beginning of the routine, and start execu-
tion. The robot should go from point to point with the torch TCP, stopping
at each point so that the position can be checked. If any positions need to be
changed, change them now.
13. Move the Program Pointer to the procedure labeled: “SearchSample”.
14. Jog the robot so that the torch TCP is above the plate and off the corner
where p1 is. Modify the first MoveJ.
503 497-502 41
SmarTac
User’s Guide
Figure 18.
Jog the robot down so that the torch gas cup is in a position to search the edge of
the plate. Refer to Figure ex5.b and modify the points the first Search_1D. The
search direction is indicated in Figure ex5.b for the displacement frame pe1a (the
first search result). Remember that the search direction should be perpendicular to
the edge of the part.
Modify all the rest of the moves and searches as prescribed by Figure ex5.b.
Test run the SearchSample procedure.
Move the Program Pointer to the routine called: “WeldSample”. WeldSample does
not have any ArcL instructions so that ArcWare need not be present to load this
module. It has only MoveL instructions with slow speeds to simulate welding.
Draw a simulated weld on the surface of the plate using a straight edge and marker
(See Figure ex5.d). WeldSample has only two segments, you may add more if you
desire.
Figure 19.
15. Modify the first point to be above the plate at least 100mm.
16. Modify the second point to be the start of the simulated weld.
17. Modify the third and fourth points to be the middle and end of the weld.
42 503 497-502
SmarTac
User’s Guide
18. Modify the last point to be above the plate at least 100mm.
19. Run WeldSample to be sure it follows the line correctly.
20. Run SearchSample.
21. Run NewPoints. The points p1, p2, and p3 should be pointed out correctly.
If not, there is a mistake somewhere. Check your program.
22. Run WeldSample again to be sure everything is ok. If the path is not fol-
lowed, check the program again.
23. Leaving the plate clamped at the corner, move the plate about 10mm at the
end.
24. Run SearchSample.
25. Run WeldSample. The path should follow correctly.
26. Run NewPoints. The points should be pointed out correctly.

Questions:
1. What work object is used in RefPoints and SearchSample?
2. What work object(s) is(are) used in NewPoints and WeldSample?
3. Is PDispSet used in this exercise? Why, or why not?

Look at the last several lines of SearchSample:
4. pe1 is the combination of what two searches?
7. For the best accuracy, there should be two searches for each reference point,
located close to each reference point. In this exercise we use only four
searches to approximate this. How far do you have to rotate the plate before
you notice the inaccuracy?
8. Why does this occur?
9. Would this be a concern for most real-world fixtures?

Advanced:
• Define the object frame of obREF so that the origin is at the corner of the
plate where p1 is. Align the object frame with the plate.
• Select obREF as the work object and WObj for the Coordinate System in
the Jog Window. You should be able to jog along the edges of the skewed
plate with straight deflections of the JoyStick. If not, the object frame was
not defined properly.
503 497-502 43
SmarTac
User’s Guide
• Go though Example 5 again with the new work object definition.
10. How might this help when programming?
5.8 Search_Part.
Sometimes it is necessary to search a part feature to determine if it is there or not.
Information like this can be used to determine what type of part is present, or if a
part is loaded at all. The SmarTac instruction, Search_Part is provided for this use.
Search_Part is programmed very much like a Search_1D instruction, but it returns
a Boolean instead of a Program Displacement. In use it looks like this:
Search_Part bPresent,p1,p2,v200,tWeldGun;
The robot moves on a path from p1 through p2. If contact is made with the part fea-
ture, the Boolean, bPresent, is set to TRUE. If no contact is made, it is set to
FALSE.
In this example a weld procedure is selected based on the presence of a particular
part feature:
44 503 497-502
SmarTac
User’s Guide
PROC Which_Part()
MoveJ *,v200,z10, tWeldGun;
MoveJ *,v200,fine, tWeldGun;
IF bPresent THEN
Big_Part;
ELSE
Small_Part;
ENDIF
ENDPROC
5.8.1 Exercise 6 Using Search_Part.
1. Create a new procedure in the module, ST_TEST. Call it disp_ex6.
2. You need only one instruction in this procedure, Search_Part. You will
have to create Boolean to use as your result. The robtargets need not be
named. Search for the edge of the plate such that you can take the plate
away later.
3. Run the routine to be sure it works OK.

Questions:
1. With the plate in place, what is the value of the Boolean after searching?
2. With the plate removed, what is the value of the Boolean after searching?
Advanced:
3. What happens when you move the plate so that it is touching the gas cup at
the start of the search?
5.9 Conclusion
This overview provides most of the techniques required to use SmarTac searching
on the majority of real-world weldments. A number of optional arguments for the
search instructions have not been explained here. For more information about
these, as well as more examples, see section 8.1 “Instructions”. You will also find
an instruction called PDispAdd which is used with the same effect as the function
PoseAdd.
Work objects were discussed briefly throughout this manual. Please consult the
Controller User’s Manual for any questions about how to use work objects to sim-
plify programming. Especially for users with coordinated work objects on posi-
tioning equipment, a firm understanding of work object user and object frames is
critical to writing good weld routines.
503 497-502 45
SmarTac
User’s Guide
46 503 497-502
SMARTAC
Software Reference
6 Software Reference
,QVWUXFWLRQV
Search_1D One-dimensional search.

Search_1D is an instruction used for tactilely searching a feature with SmarTac.
The search path is described by two required robtargets. The search result is stored
as pose data in the required argument ‘Result’. All SmarTac board activation and
deactivation is automatically handled.
Example
Search_1D peOffset,p1,p2,v200,tWeldGun;
The robot moves on a path from p1 through p2. When contact is made with the part
feature, the difference between the contact location and p2 is stored in peOffset.
Arguments
Search_1D [\NotOff] Result [\SearchStop] StartPoint SearchPoint
Speed Tool [\WObj ] [\PrePDisp] [\Limit] [\SearchName]
>?1RW2II@ 'DWDW\SHVZLWFK
If selected, the welding positive lead secondary contact (break box) remains open at
the end of the search. Additionally, the SmarTac board remains activated after the
search ends. If this switch is selected directly before a welding instruction, welding
current will not reach the torch.
5HVXOW 'DWDW\SHSRVH
The displacement frame that will be updated
[\SearchStop] Data type: robtarget
If selected, this robtarget will be updated as the point where the robot detects
the part feature.
StartPoint Data type: robtarget
The start point of the search motion.
SearchPoint Data type: robtarget
503 497-502 47
SMARTAC
Software Reference
The point where the robot expects to touch the part. This robtarget is pro-
grammed so that the torch is touching the surface of the part feature.
6SHHG 'DWDW\SHVSHHGGDWD
The speed data used when moving to the StartPoint. The velocity of the
search motion is unaffected.
Tool Data type: tooldata
The tool used during the search.
[\WObj Data type: wobjdata
The work object used during the search. WObj determines what frame Result
will be related to. If not selected, wobj0 is used.
[\PrePDisp] Data type: pose
If selected, the search will be conducted with this displacement frame active,
effectively adding the two displacement frames. This may or may not be the
same as the pose data selected for Result.
[\Limit] Data type: num
If selected, an error will be flagged if the magnitude of the search result,

Result, is larger than the value entered for the Limit. (millimeters)
[\SearchName] Data type: string
If selected, the search will be assigned this identifying name. The name will
accompany any error messages that are written to the User Error Log.
Program execution
When executed, the robot makes an ‘L’ move to the start point, StartPoint. The
SmarTac board is activated and motion starts towards the search point, SearchPoint.
The robot will continue past the search point for a total search distance described by
twice the distance between StartPoint and SearchPoint. Once the part feature is
sensed, motion stops, and the displacement data, Result, is stored. This program
displacement can later be used to shift programmed points using the RAPID instruc-
tion PDispSet.
Limitations
If the switch, NotOff, is selected, the welding positive lead secondary contact (break
box) remains open at the end of the search. If this switch is selected directly before
a welding instruction, welding current will not reach the torch and an Arc Ignition
Error will occur.
48 503 497-502
SMARTAC
Software Reference
Fault management
If an error occurs when activating the SmarTac board, a menu will appear with the
following prompts:Activation of the SmarTac failed
RETRY: Tries to search again with

start point moved 50%
RETURN: Continues the program with

default search result
RAISE: Sends error to calling routine.
When RETRY is selected the start point of the search is shifted farther from the part
feature. This may give a good search result in cases where the part feature is unu-
sually close and the torch is touching the part feature at the beginning of a normal
search.
When RETURN is selected a default search result is used which will include any
pre-offset included in the search instruction. A message will be logged in the User
Error Log.
If an error occurs during the search process, a menu will appear with the following
prompts:
Search failed

end point moved 50%

When RETRY is selected the end point of the search is shifted farther into the part
feature. This may give a correct search in cases where the part feature is unusually
far away from the search.
Error Log.
If the torch makes contact with the part before the search begins, the following
menu appears:

start point moved 50%

503 497-502 49
SMARTAC
Software Reference
When RETRY is selected the start point of the search is shifted farther from the part
feature. This may give a good search result in cases where the part feature is unu-
sually close and the torch is touching the part feature at the beginning of a normal
search.
Error Log.
If the optional argument Limit is selected and the magnitude of peResult is larger
than the value entered for the Limit, the following message appears:
The search result is outside spec.

Offset:= [12.012,3.002,-5.013]
The magnitude of the offset:= 13.34
The preset limit:= 10
OK: Continue with program execution.

RAISE: Sends the error to calling routine.
When OK is selected the search result is accepted regardless of magnitude. A mes-

sage will be logged in the User Error Log.
Examples
Single dimension search in any direction:
MoveJ *, vmax,fine, tWeldGun;

Search_1D peOffset,p1,p2,v200,tWeldGun
PDispSet peOffset;ArcL\On,*,vmax,sm1,wd1,wv1,z1,tWeldGun;
ArcL\Off,*, vmax,sm1,wd1,wv1,z1,tWeldGun;
MoveJ *, vmax,z10, tWeldGun;
ArcL\On,*,vmax,sm1,wd1,wv1,z1,tWeldGun;
ArcL\Off,*, vmax,sm1,wd1,wv1,z1,tWeldGun;
PDispOff;
Two dimension searching in any direction in a defined work object:
MoveJ *, vmax,fine, tWeldGun\WObj:= wobj2;

Search_1D\NotOff, pose1, p1,p2,v200,tWeldGun\WObj:=wobj2;
Search_1D pose1,p3,p4,v200,tWeldGun\WObj:=wobj2\PrePDisp:= pose1;PDisp-
Set pose1;
ArcL\On,*,vmax,sm1,wd1,wv1,z1,tWeldGun\Wobj:= wobj2;
ArcL\Off,*, vmax,sm1,wd1,wv1,z1,tWeldGun\Wobj:= wobj2;
MoveJ *, vmax, z10, tWeldGun\WObj:= wobj2;
ArcL\On,*,vmax,sm1,wd1,wv1,z1,tWeldGun\Wobj:= wobj2;
ArcL\Off,*, vmax,sm1,wd1,wv1,z1,tWeldGun\Wobj:= wobj2;
PDispOff;
Important: It is typically unproductive to have two searches in the same

direction for the same feature. Multiple searches in the same
50 503 497-502
SMARTAC
Software Reference
direction using the PrePDisp option will be averaged. Searches

for a single feature should almost always be 90 degrees from
each other. This fact implies that usually there should never be
more than three searches on any one feature.
Other variations:
One dimensional search with the maximum limit set at 4mm. If the magnitude of
the trans portion of peOffset is greater than 4mm an error is flagged:
Search_1D,peOffset,p1,p2,v200,tWeldGun\Limit:=4;
One dimensional search with the gas cup. The robtarget p3 is updated with the
actual search position:
Search_1D\SearchStop:=p3,pose1,p1,p2,v200,tWeldGun;
One dimensional search with the gas cup. If an error occurs while searching and the
operator elects to continue with default results, the name, First, will appear along
with the error description, in the User Error Log. See: Fault Management above.
Search_1D pose1,p1,p2,v200,tWeldGun\SearchName:=”First”;
Syntax
Search_1D
[‘\ ‘ NotOff ‘,’]
[ Result ’:=’ ] < expression (INOUT) of pose > ’,’
[ ‘\’ SearchStop ’:=’ < expression (INOUT) of robtarget >’,’ ]
[ StartPoint ’:=’ ] < expression (IN) of robtarget > ’,’
[ SearchPoint ’:=’ ] < expression (IN) of robtarget > ’,’
[ Speed ’:=’ ] < expression (IN) of speeddata > ’,’
[ Tool ’:=’ ] < persistent (PERS) of tooldata >
[ ‘\’ WObj ’:=’ < persistent (PERS) of wobjdata > ]
[ ‘\’ PrePDisp‘:=’ < expression (IN) of pose > ]
[ ‘\’ Limit ‘:=’ < expression (IN) of num > ]
[ ‘\’ SearchName ‘:=’ < expression (IN) of string > ] ‘;’
503 497-502 51
SMARTAC
Software Reference
Related information
Described in:
Search_Groove SmarTac Instructions
Search_Part SmarTac Instructions
datatype: pose Rapid Reference datatypes
datatype: wobjdata Rapid Reference datatypes
datatype: robtarget Rapid Reference datatypes
Search_Part Search for feature presence.

Search_Part is an instruction used for tactilely searching a feature with SmarTac.
The search path is described by two required robtargets. If a feature is detected, a
required Boolean is set to TRUE, otherwise it is set to FALSE. In either case, pro-
gram execution continues.
Example
The robot moves on a path from p1 through p2. If contact is made with the part fea-
ture, the Boolean, bPresent, is set to TRUE. If no contact is made, it is set to FALSE.
Arguments
Search_Part [\NotOff] bDetect StartPoint SearchPoint Speed Tool
[\WObj]
[\NotOff] Data type: switch
If selected, the welding positive lead secondary contact (break box) remains
open at the end of the search. Additionally, the SmarTac board remains acti-
vated after the search ends. If this switch is selected directly before a welding
instruction, welding current will not reach the torch.
bDetect Data type: bool
The Boolean that will be updated. TRUE: if the part is sensed, FALSE: if the
part is not sensed.
StartPoint Data type: robtarget
52 503 497-502
SMARTAC
Software Reference
The start point of the search motion.
SearchPoint Data type: robtarget
The point where the robot expects to touch the part. This robtarget is pro-
grammed so that the torch is touching the surface of the part feature.
Speed Data type: speeddata
The speed data used when moving to the StartPoint. The velocity of the
search motion is unaffected.
Tool Data type: tooldata
The tool used during the search.
[\WObj Data type: wobjdata
The work object used during the search. WObj determines what frame peRe-
sult will be related to. If not selected, wobj0 is used.
Program execution
When executed, the robot makes an ‘L’ move to the StartPoint with the velo-
city selected in Speed. The SmarTac board is activated and motion starts
towards the SearchPoint. The robot will continue past the search point for a
total search distance described by twice the distance between StartPoint and
SearchPoint. If a feature is detected, the required Boolean is set to TRUE, oth-
erwise it is set to FALSE. In either case, program execution continues.
Limitations
If the switch, NotOff, is selected, the welding positive lead secondary contact
(break box) remains open at the end of the search. If this switch is selected
directly before a welding instruction, welding current will not reach the torch
and an Arc Ignition Error will occur.
Fault management
If an error occurs during the search process, a menu will appear with the fol-
lowing prompts:
RETRY: Tries to search again.

DETECT: Continues the program with
detection TRUE
REJECT: Continues the program with
detection FALSE
RAISE: Sends error to calling routine
503 497-502 53
SMARTAC
Software Reference
If RETRY is selected the robot will move to the StartPoint, then to the
approach point before searching. When DETECT or REJECT are selected, a
message is stored in the User Error Log.
Examples
In this example a procedure is selected based on the presence of a particular
part feature:
PROC Which_Part()
MoveJ *,v200,z10, tWeldGun;
MoveJ *,v200,fine, tWeldGun;
IF bPresent THEN
Big_Part;
ELSE
Small_Part;
ENDIF
ENDPROC
Other Variations:
Searching with the wire:
Search_Part\Wire,bPresent,p1,p2,v200,tWeldGun;
Two searches in a work object:
Search_Part\NotOff,bPart1,p1,p2,v200,tWeldGun\WObj:=obPart;
Search_Part bPart2,p3,p4,v200,tWeldGun\WObj:=obPart;
Syntax
Search_Part
[‘\ ‘ NotOff ‘,’]
[ bDetect’:=’ ] < expression (INOUT) of bool > ’,
[ StartPoint ’:=’ ] < expression (IN) of robtarget > ’,’
[ SearchPoint ’:=’ ] < expression (IN) of robtarget > ’,’
[ Speed ’:=’ ] < expression (IN) of speeddata > ’,’
[ Tool ’:=’ ] < persistent (PERS) of tooldata > ’,’
[ ‘\’ WObj ’:=’ < persistent (PERS) of wobjdata > ] ‘;’
Related information
Described in:
Search_1D SmarTac Instructions
datatype: bool Rapid Reference datatypes
54 503 497-502
SMARTAC
Software Reference
PDispAdd Add program displacements.

PDispAdd is an instruction used to add a program displacement frame to the current
program displacement frame.
Example
PDispAdd pose2;
Pose2 is added to the current displacement frame.
Arguments
3'LVS$GG5HVXOW
Result Data type: pose
The displacement frame added to the current program displacement frame.
Program execution
When executed, Result is added to the current displacement frame, and the
new program displacement frame is activated.
Syntax
PDispAdd
[ Result ’:=’ ] < expression (IN) of pose > ’;’
Related information
Described in:
Search_1D SmarTac Instructions
PoseAdd SmarTac Functions
503 497-502 55
SMARTAC
Software Reference
)XQFWLRQV
PoseAdd Adds the translation portions of pose data

PoseAdd is a function that requires two or three pose data arguments and returns the
summation of the translation portions in pose form. The returned pose data will
have the quaternions set to [1,0,0,0].
Example
peSUM:=PoseAdd (peFIRST,peSECOND);
peSUM.trans is set equal to peFIRST.trans + peSECOND.trans. The rota-

tional portion of the peSUM is set to [1,0,0,0] by default.
Return value Data type: pose

The displacement frame.
Arguments
3RVH$GG3RVH3RVH>?3RVH@
Pose1 Data type: pose
Pose data to be added.
Pose2 Data type: pose
[\Pose3] Data type: pose
Syntax
PoseAdd ‘(‘
[ Pose1 ’:=’ ] < expression (IN) of pose > ’,’
[ Pose2 ’:=’ ] < expression (IN) of pose > ’,’
[‘ \’Pose3 ’:=’ < expression (IN) of pose > ] ’)’
56 503 497-502
SMARTAC
Software Reference
Related information
Described in:
PDispAdd SmarTac Instructions
OFrameChange Create a new, shifted object frame

OframeChange is a function that returns a work object based on a required reference
work object, three reference points, and three corresponding displace-
ments,described within the reference work object.
Example
P1
X (reference)
displaced
P2
X (reference) displaced
RefP1
RefP2
New work object

Reference work
object P3
displaced
RefP3 Y (reference)
Y (reference)
obNEW:=OframeChange(obREF,p1,p2,p3,pe1,pe2,pe3);
The movement of the points p1, p2, and p3 described by displacement

frames pe1, pe2, and pe3, is superimposed over the object frame of the ref-
erence work object, obREF. The new work object, obNEW, has this new
object frame and the original user frame information from obREF.
Return value Data type: wobjdata

The new work object.
Arguments
2)UDPH&KDQJH:2EM5HI35HI35HI3'LVS3'LVS3'LVS3
503 497-502 57
SMARTAC
Software Reference
WObj Data type: robtarget
Reference work object.
RefP1 Data type: robtarget
Reference point number one. (Defined in WObj)
Reference point number two. (Defined in WObj)
Reference point number three. (Defined in WObj)
DispP1 Data type: pose
Displacement frame affecting reference point RefP1. (Defined in WObj)
Limitations
The reference points can be any three points in space, but they must be
defined in the reference work object. Similarly, the displacements should be
related to the reference work object. The reference points do not have to be
the same points as those used in defining the reference work object.
Syntax
OFrameChange ‘(‘
[ WObj ’:=’ ] < expression (IN) of wobjdata > ’,’
[ RefP1’:=’ ] < expression (IN) of robtarget > ’,’
[ DispP1’:=’ ] < expression (IN) of pose > ’,’
[ DispP2’:=’ ] < expression (IN) of pose > ’,’
[ DispP3’:=’ ] < expression (IN) of pose > ’)’
58 503 497-502
SMARTAC
Software Reference
Related information
Described in:
PDispAdd SmarTac Instructions & Functions
PoseAdd SmarTac Instructions & Functions
datatype: wobjdataRapid Reference datatypes
datatype: robtargetRapid Reference datatypes
503 497-502 59
SMARTAC
Software Reference
2IUDPH0RGXOH5HIHUHQFH
Exercise 5 uses a program module called “OFrame”. The module is included on a
floppy disk with the manual. Its purpose is to speed up the training process, whether
it be an ABB training course or end-users training themselves. If the disk is not
present, use this printout to assist in writing the code. Note: Generic robtargets
have been reduced to “*” to save space.
! Example Module
MODULE OFrame
PERS wobjdata
obREF:=[FALSE,TRUE,"",[[0,0,0],[1,0,0,0]],[[0,0,0],[1,0,0,0]]];
PERS wobjdata
obNEW:=[FALSE,TRUE,"",[[0,0,0],[1,0,0,0]],[[0,0,0],[1,0,0,0]]];
PERS robtarget p1:=*;
PERS pose pe1a:=[[0,0,0],[1,0,0,0]];
PERS pose pe1b:=[[0,0,0],[1,0,0,0]];
PERS pose pe2a:=[[0,0,0],[1,0,0,0]];
PERS pose pe3a:=[[0,0,0],[1,0,0,0]];
PERS pose pe1:=[[0,0,0],[1,0,0,0]];
PERS pose pe2:=[[0,0,0],[1,0,0,0]];
PERS pose pe3:=[[0,0,0],[1,0,0,0]];
PROC NewPoints()
PDispOff;
MoveJ RelTool(p1,0,0,-100),v200,fine,tWeldGun\WObj:=obREF;
MoveL RelTool(p1,0,0,-50),v200,fine,tWeldGun\WObj:=obNEW;
MoveL p1,v200,fine,tWeldGun\WObj:=obNEW;
Stop;
Stop;
Stop;
MoveJ RelTool(p3,0,0,-100),v200,fine,tWeldGun\WObj:=obREF;
ENDPROC
60 503 497-502
SMARTAC
Software Reference
PROC WeldSample()
MoveJ *,v200,fine,tWeldGun\WObj:=obNEW;
! Simulated weld:
MoveL *,v200,fine,tWeldGun\WObj:=obNEW;
MoveL *,v20,z1,tWeldGun\WObj:=obNEW;
MoveL *,v20,fine,tWeldGun\WObj:=obNEW;
MoveJ *,v200,fine,tWeldGun\WObj:=obNEW;
ENDPROC
PROC SearchSample()
PDispOff;
MoveJ *,v200,fine,tWeldGun\WObj:=obREF;
Search_1D pe1a,*,*,v200,tWeldGun\WObj:=obREF;
MoveL *,v200,fine,tWeldGun\WObj:=obREF;
Search_1D pe1b,*,*,v200,tWeldGun\WObj:=obREF;
MoveL *,v200,z10,tWeldGun\WObj:=obREF;
MoveL *,v200,z10,tWeldGun\WObj:=obREF;
pe1:=PoseAdd(pe1a,pe1b);
pe2:=PoseAdd(pe1a,pe2a);
pe3:=PoseAdd(pe1b,pe3a);
obNEW:=OFrameChange(obREF,p1,p2,p3,pe1,pe2,pe3);
ENDPROC
PROC RefPoints()
PDispOff;
MoveL RelTool(p1,0,0,-50),v200,fine,tWeldGun\WObj:=obREF;
MoveL p1,v200,fine,tWeldGun\WObj:=obREF;
Stop;
Stop;
Stop;
ENDPROC
ENDMODULE
0HFKDQLFDO5HIHUHQFH
No mechanical references are included with the SmarTac package.
503 497-502 61
SMARTAC
Software Reference
62 503 497-502
SMARTAC
Electrical Reference
(OHFWULFDO5HIHUHQFH
SmarTac Reference
Without wire searching capability.
Drawing number: xxxxxxxxxxx
503 497-502 63
SMARTAC
Electrical Reference
64 503 497-502
SMARTAC
Warranty
:DUUDQW\
(a) EQUIPMENT WARRANTY. ABB warrants that the equipment shall be
free from defects in material and workmanship for the applicable Warranty Period
as described below. The Warranty Period shall be either: one year from date of ship-
ment; or if ABB installs the equipment or accepts a standard ABB Robot Installa-
tion Report from the installer, for a period of one year from completion of
installation, but not to exceed eighteen months from date of shipment; but in any
event the Warranty Period shall not exceed 4000 operating hours. Should any fail-
ure to conform with the applicable warranty appear during the specified period,
ABB shall, if given prompt notice by Buyer, repair, replace, or modify the defective
part or parts. New spare parts and refurbished parts shall be subject to the same war-
ranty as original equipment.
Repairs or replacements pursuant to warranty shall not renew or extend the original
equipment warranty period; provided, however, that any such repairs or replace-
ments shall be warranted for the time remaining of the original warranty period or
30 days, whichever is longer. ABB’s repair or replacement hereunder shall be
exclusive of any removal or installation costs, freight or insurance. ABB shall not
be responsible for providing working access to the defect.
(b) SERVICES. ABB warrants that the services of its personnel, if provided,
will be performed in a workmanlike manner. Should a failure to comply with this
warranty appear within six months from the date of completion of such services,
ABB shall, if promptly notified in writing, at its option, either provide the services
anew or pay Buyer the cost of procuring such services.
(c) SOFTWARE. ABB warrants for a period of one (1) year from the date of
shipment from ABB that the software furnished under this order will perform in
accordance with published or other written specifications prepared, approved, and
issued by ABB , when used with specifically identified hardware. In any event,
ABB makes no representation or warranty, express or implied, that the operation of
the software will be uninterrupted or error free, or that the functions contained in the
software will meet or satisfy the Buyer’s intended use or requirements.
(d) CONDITIONS OF WARRANTY. This warranty shall not apply to any

equipment or parts which (i) have been improperly installed, repaired or altered, (ii)
have been subjected to misuse, negligence or accident, or (iii) have been used in a
manner contrary to ABB operating and maintenance procedures.
THE ABOVE WARRANTIES AND REMEDIES ARE EXCLUSIVE AND IN

LIEU OF ANY AND ALL OTHER REPRESENTATIONS, SPECIFICATIONS,
WARRANTIES AND REMEDIES EITHER EXPRESS OR IMPLIED, HEREIN
OR ELSEWHERE, OR WHICH MIGHT ARISE UNDER LAW OR EQUITY OR
CUSTOM OF TRADE INCLUDING WITHOUT LIMITATION WARRANTIES
OF MERCHANTABILITY AND OF FITNESS FOR A SPECIFIED OR
INTENDED PURPOSE. THE REMEDY SPECIFIED REPRESENTS THE SOLE
LIABILITY OF ABB AND THE SOLE REMEDY OF BUYER WITH RESPECT
TO OR ARISING OUT OF THE EQUIPMENT OR SERVICES WHETHER
BASED ON CONTRACT, TORT (INCLUDING NEGLIGENCE AND STRICT
LIABILITY), OR OTHERWISE.
503 497-502 65
SMARTAC
Warranty
66 503 497-502
SMARTAC
Contacts
&RQWDFWV
Please direct all technical and parts inquiries to:
ABB Flexible Automation.

Welding Systems
695 80 Laxå
Sweden
Ph: +46 (0)584-81666
Please have IRB serial numbers on hand.
503 497-502 67
SMARTAC
Contacts
68 503 497-502
SMARTAC
Glossary
*ORVVDU\
Baseframe A frame representing the relationship of a robot’s base to
the world frame.
Displacement A frame that represents the spatial relationship between a

work object and a robtarget. Displacements are
represented by pose data in RAPID. Search results are
typically displacements.
Electrode Extension The location at the tip of the consumable welding wire
where metal transfer occurs.
Frame A coordinate system. Work objects, tool data,

displacements, robtargets, etc. are all constructed from
frames. Frames are represented by pose data in RAPID.
Gas Cup The outer cylindrical portion of a MIG gun that directs the
shielding gas over the weld puddle. Often used as a
search-sensing surface. Also called a nozzle.
Nozzle See Gas Cup.
Pose data A frame in RAPID. It is represented by Cartesian

coordinates and quaternions. (x,y,z,q1,q2,q3,q4)
RAPID A C-based programming language used for ABB robots.
Robtarget A frame representing a position in space. Movement

instructions like MoveL, MoveJ, ArcL, and Search_1D,
all require robtargets.
SmarTac A tactile sensor used to detect inconsistent weld joints and

return correctional data to adjust welding position.
Stickout The distance measure from the contact tip to the weld
seam.
TCP Tool Center Point. The frame representing the spatial

relationship between the electrode extension and the
wrist of the robot.
Tooldata A frame representing the TCP in RAPID.
Work object wobjdata. RAPID data type composed of two frames,

the “user frame” and “object frame”. These two frames
together represent the spatial relationship between the
World and a program displacement frame.
World All spatial frame relationships are ultimately related to the

world frame.
503 497-502 69
SMARTAC
Glossary
70 503 497-502
503 497-502
2001-03-06

Touchabb2 PDF

Uploaded by

Copyright:

Available Formats

Touchabb2 PDF

Uploaded by

Document Information

Original Title

Copyright

Available Formats

Share this document

Share or Embed Document

Sharing Options

Did you find this document useful?

Is this content inappropriate?

Copyright:

Available Formats

Touchabb2 PDF

Uploaded by

Copyright:

Available Formats

Product Manual

ABB Welding Systems

© ABB Welding Systems AB

Article number: 503 497-502

ABB Welding Systems AB

2 Technical description .................................................................................................. 7

6.2 Functions ............................................................................................................ 56

1.1 Product Overview

1.2 Operation Overview

1.3 Requirements Overview

1.3.1 System Prerequisites

1.3.2 User’s Qualifications

The search properties of SmarTac/PIB are determined by two of the adjustable

2.3 Function Description - Searching

Activating the Sensor (Sensor 1)

Checking the Sensor (Voltage Valid Limit)

Sensitivity (Sensor Detection Sensitivity)

2.5 Technical Data

Serial number Date of testing

ABB rituals nummer

3.1 Components List

3.2 Tools Required

3.3 Hardware set-up

3.3.1 SmarTac Board Installation

1. Turn off incoming power to S4Cplus controller.

2. When handling the SmarTac board, avoid electrical discharge damage by

3.4 Software set-up

3.4.2 System Parameters

Board Channel Designation Association

B_PROC_30 Input Ch 10 diSE_VALID SmarTac

B_PROC_30 Output Ch 12 doSE1_SEL SmarTac

B_PROC_30 Output Ch 14 doSE_REF SmarTac

B_PROC_30 Output Ch 7 diSE1_DET SmarTac

3.4.3 Loading Software

4.1 Searching Conditions

4.2 Programming Limitations

4.3 Signals and Connections

diSE_DET Input used for surface detection.

4.3.1 I/O Timeline

1. How do my parts deviate?

5.3 What is a Frame?

In the figure, P1 is a robtarget frame. Pdisp is the current program displacement

5.3.1 Exercise 1 Program Displacement

2. Create a new routine in that module and call it “disp_ex1”.

10. Now insert the instruction: PDispOff.

17. View the data in peEX1 by selecting “Edit” and “value”:

19. Hit OK and run the routine, disp_ex1, again.

5.4 Using SmarTac to modify a Displacement Frame.

The following exercise demonstrates the instruction, Search_1D.

5.4.1 Exercise 2 One Dimensional Search

1. View the routines in the module “ST_TEST”.

3. Remove the paper with the rectangle drawn on it.

Figure 8. “Top View”

5. Edit the values in peEX1 so that X, Y, and Z equal zero.

9. Toggle the Program Window to instruction mode. If a “Most Common”

Figure 11. “Top View”

2. What happens when the plate is moved in other directions?

5.4.2 Programming Tips

5.5 Using SmarTac for Multi-Dimensional Searching.