DE19740306A1 - Loom control - Google Patents

Abstract

The loom control system (1) with a CAN bus (7), or other bus system, is extended by a daisy chain (ITL-HIN). After the loom has been switched on, or after a number of machine conditions, there is an initial automatic configuration of the internal and external units for the bus, and then the start is released for the daisy chain to be used for the configuration and, selectively, also as a trigger line. Fixed addresses are established for the operation of the units (3-5) with the same function or to be bought in. The units with the same function have a group address for a multiple function, and each unit is assigned an additional number.

Description

A standardized CAN bus consists of the lines CAN-H, CAN-L and Ground.

The task of this and other bus systems is to transmit digital information to and from different participants from or to a higher-level controller, d. H. various actuators and sensors are controlled by the higher-level control device controlled according to their task or deliver data to them for processing Control device.

So that every authority receiving the order knows that it is meant or the higher-order one Control device recognizes which measuring point is sending, an address must be sent, which uniquely identifies the receiving, sending body. Both command-receiving places is usually proceeded in such a way that these places through a number of switches at their input a binary address fixed (but changeable) is assigned. Such a fixed assignment can also be done differently, for. B. by Realize EEPROMs.

In the case of a large number of positions, this means precise documentation of the specified Addresses and the correct settings on the relevant devices.

When expanding or restricting the function reception on a weaving machine must the higher-level control device is also informed of the functions additionally or less are in operation so that this control device works properly can work.

It is therefore desirable if the control device has the number and operation of the active bodies could recognize themselves and the individual bodies in turn on a case-by-case basis Case can assign addresses itself.

A system can also consist of a mixture of fixed and variable device addresses exist where z. B. special or main functions such a fixed address is assigned.

The object of the invention is achieved as described below.

The standardized CAN bus (or another bus system) is used to solve the problem a daisy chain extended. The connected function stations in a configuration mode of the Higher-level control device addressed (determined), identified and in sequence assigned an address to them or determined their fixed address and the Configuration status for the actual operating status of the control device saved. After this initialization has been completed, this Daisy chain line can also be used as a trigger line.

The following lines are implemented as a bus (using the CAN bus as an example) ( Fig. 1):

• - 24V
• - GND
• - CAN high
• - CAN low
• - ITL-HIN-OUT → ITL-HIN-IN
• - ITL RUECK

The CAN bus and the power supply are routed serially through each device. Via the initialization trigger lines (ITL-HIN and ITL-RUECK), the higher-level control device sequentially recognizes the number of connected devices (see Fig. 2).

Fixed device addresses, e.g. B. Dobby = 1, used. The request is carried out by a LEX message. (LEX = Lindauer Dornier external CAN bus).

Initialization process

• 1. All switches in the ITL-HIN line are open.
• 2. The bus master (machine) sends a message 128 with device address z. B. (Byte 0 = 1) and waits a defined time for an answer.
• 3. The bus salvo replies with its device ID.
• 4. The master assigns an address based on this identifier and the device switches the ITL HIN line through.
• 5. The master initializes all other devices in this way.
• 6. If all devices configured in the machine control have their addresses, the recognizes Master the end of the initialization through the closed ITL line and sends the Initialization end telegram as a broadcast message to all participants. Put this their CAN receive filter according to their address and are then ready for normal operation. The system structure is now complete.

Devices with and without ITL lines can be initialized on the bus. she differ in their device address.

Devices with ITL all have the address 0 and can therefore be used more than once (even the same devices) operated on the bus.

Devices without ITL have an address greater than 0 and only one device can use the be operated at the same address.

Allocation of the CAN identifier

Fixed CAN identifiers are used for the system initialization phase. A A fundamental component of this phase is the free assignment of further identifiers of the Loom to the connected devices for the subsequent normal operation. Included several devices can be combined into groups, which then together can be addressed.

During the initialization phase, the weaving machine is the bus master, after which all bus participants have equal rights.

Direction: Identifier: Initialization phase: @ Master → slave 0 Master ← slave 400 h + device address 0 or 1-128 Operation:@ Master → slave 200 h + group address + device address or 0 Master ← slave 400 h + group address

The device address is only used to identify an external device during the System structure. It is to be agreed and has z. B. the values 0. . . 15th

The group address is assigned by the master (= machine) depending on the configuration.

The number in the group is used to select a group member. It is part of it the telegram data and not the identifier.

Processes

The telegram communication between machine and devices is described below described.

initialization

The machine control initializes all devices on the bus, e.g. B.

Telegram description

Requirement of the device type:
Identifier: 0
Direction: machine → device
Function: The machine requests the device ID and type from the device, e.g. B.

The telegram may be sent by the machine at the earliest a certain time after power on (= reset time).

Device ID:
Identifier: 400 h + device address e.g. B. 400
Direction: devices → machine
Function: The device reports its device ID to the machine

Device ID: 1 = specific device, 0 = LEX
Version: 0
Device version: ASCII bytes

Set address parameters

Identifier: 0
Direction: machine → device
Function: The machine informs the device of its address parameters that are valid for further operation (group address and CAN send ID).

End of initialization

Identifier: 0
Direction: machine → device
Function: The machine reports to the devices that the system build-up phase has ended and that the addresses communicated in the set "address parameter telegram" are valid from now on. The devices now set their CAN input filters (mask registers) and now go into the operating state at the latest.

Claims (3)

1. Loom control with a CAN bus or another bus system, characterized in that the CAN bus is extended by a daisy chain to automatically internal and external using this daisy chain after switching on the loom or after certain machine states To configure devices for the CAN bus of the weaving machine and then to enable the start and to use this line as a trigger line after the configuration. 2. Extended CAN bus according to claim 1, characterized in that for certain, for Fixed identifiers required for operation, functionally identical or purchased devices (Addresses) can be specified. 3. Extended CAN bus according to claim 1 and 2, characterized in that functionally identical devices with a multiple function receive a group identifier and each individual device is addressed via an additional count number.