PHOTOSWITCH R Photoelectric Sensors

42BC Long Range Background Suppression

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Description General Specifications

The 42BC photoelectric sensor offers Unit Protection Output short circuit (SS version only), reverse polarity, false pulse,
high performance background transient noise
suppression performance at sensing Supply voltage 12–24V DC
ranges up to 2m (6.6ft). This type of
Current Consumption 30mA maximum
sensing capability is desirable in
applications where standard transmitted Output Type NPN and PNP (DC version)
beam or retroreflective sensing is not SPST N.O. relay (AC version)
practical due to no easy access to both Output Mode Light/dark operate selectable
sides of the target or when economics Output Rating 100mA@24V DC
is a major factor. 3A@240V AC
The 42BC photoelectric sensor uses a Response Time 20ms maximum (DC version)
triangulation method to mechanically 30ms maximum (AC version)
adjust the sensing angle, thereby, Housing Material Polycarbonate
ensuring reliable detection of the target Lens Material Acrylic
while ignoring the background. Using
the sensitivity adjustment on the top LED Indicators See User Interface on page 1–130
cover, the desired sensing range can Connection Types Screw terminal, 16 AWG (1.3mm2)
be dialed in to meet the specific Supplied Accessories Right angle mounting bracket
application.
Optional Accessories Cordsets, mounting brackets—see Section 5
The 42BC is available in either a 1m Operating Environment NEMA 1, 12, 13 IP65 (IEC529)
(3.3ft) or 2m (6.6ft) sensing range. For
applications where the sensing Vibration 10–55Hz, 1mm amplitude, Meets or exceeds IEC 60947–5–2
distances are much shorter use of the Shock 30g with 1ms pulse duration, Meets or exceeds IEC 60947–5–2
RightSight background suppression Operating Temperature –25_C to +55_C (–13_F to +131_F)
sensor is recommended. These
Relative Humidity 5…85%
sensors offer a fixed 50mm (2in) and
100mm (4in) sensing range. Similar Approvals UL listed, CSA certified, and CE marked for all applicable directives
long range sensing distances may be
solved with the 42BT photoelectric
sensor also. This sensor provides a Features
smaller package style for space critical General Information
installations. • Long range background suppression
Wiring Diagrams . . . . . . . . . page 1–130
diffuse sensing mode
Dimensions . . . . . . . . . . . . . page 1–130
• Adjustable range settings
• Slim housing style Sensing Modes
• Highly visible LED Indicators Background Suppression . page 1–131
• Screw terminal connections Accessories
• Both NPN and PNP outputs (DC) Quick-Disconnect Cables . . . page 5–1
• SPST relay output (AC) Mounting Assemblies . . . . page 1–301
• Short-circuit protected outputs Replacement Cover . . . . . . page 1–305

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PHOTOSWITCH R Photoelectric Sensors
42BC Long Range Background Suppression

User Interface Panel

Label Color State Status Light Operate/Dark
Oper te Switch
Operate Output
Out ut Indicator
OFF 0.8>margin>1.2
M rgin
Margin Green

Farr
ON 0.8<margin<1.2
OFF Output not activated

Near
Ne
O tp t
Output Red
ON Output activated
Stability Indicator
Range Adjustment

Wiring Diagrams
Terminal Version
Relay Output Type Solid State Output Type Terminal No.
Terminal No.

1 24 V–240V AC/DC 1 +12V–24V DC

2 2 –DC

3 3 PNP Output
Output 24–250V
AC/DC 3A Max
4 4 NPN Output

Note: Details regarding connection of Allen-Bradley Bulletin 42BC photoelectric sensors to Allen-Bradley Programmable Controllers
can be found in publication 42-2.0.

Dimensions—mm (inches)
Removable, see-through 17
snap on wiring Cover (0.669)

Lens 69
(2.716)
23.5 (0.925)
35 68
(1.378) 5.5 (0.216) (2.677)
11.5 (0.45)

26
Optical 12 50 (1.968) (1.023)
Axis (0.472)
68 (2.677) 2–Dia. 5.2 (0.204)
2 Places

Detection Direction Motion in up/down direction cannot be Minimum Sensing Distances

Due to the detection method, the detected. Near Setting
sensor must be positioned such that the 2.5% black 8cm (3.15in) at 2X margin
target passes in the direction illustrated. 100% white 3cm (1.18in) at 2X margin
Far Setting
2.5% black 20cm (7.9in) at 2X margin
100% white 4cm (1.57in) at 2X margin
Target

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 PHOTOSWITCH R Photoelectric Sensors
42BC Long Range Background Suppression

Typical Response Curves

Object
to be 1m Background Suppression 2m Background Suppression
Sensed
100 100
Background

Operating Margin
Operating Margin
Specifications
Field of View 3.5_ 10 10
Minimum Sensing
30mm (1.2in)
Distance
Emitter LED Infrared 880nm

1 1
0 0.1m 1m
QD Cordsets and Accessories (0.3ft) (3.2ft)
0.1m 1m 10m
(0.3ft) (3.2ft) (32.8ft)
DC Micro QD Cordset,
889D–F4AC–2 Operating Distance Operating Distance
Straight, 4-pin, 2m
AC Micro QD Cordset,
889R–F4AEA–2
Straight, 4-pin, 2m
Pico QD Cordset,
Beam Patterns
889P–F4AB–2
Straight, 4-pin, 2m 3 8
Other Cordsets Available 5–1, 5–44, 5–52 2
6
Beam Diameter—cm

Beam Diameter—cm
Mounting Assemblies 1–301 4
1
2
0 0
–2
–1
–4
–2
–6
–3 –8
0 0.2m 0.4m 0.6m 0.8m 1m 0 0.4m 0.8m 1.2m 1.6m 2m
(0.67ft) (1.31ft) (1.97ft) (2.63ft) (3.28ft) (1.31ft) (2.63ft) (3.94ft) (5.25ft) (6.56ft)

Operating Distance Operating Distance

Selection Guide
Output Type Max
Operating Voltage Sensing Output Capacity Leakage Connection
Supply Current Distance Energized Response Time Current Type Catalog Number

1m (3.3ft) NPN/PNP 42BC–B1LBAL–T4

12 24V DC ±10%
12–24V Selectable
electable
0 5mA
0.5mA Screw terminals
30mA 100mA
2m (6.6ft) 20ms accepts up to 42BC–B1LBAN–T4
Light/Dark
(2) 16AWG
Selectable S.P.S.T. N.O. Relay
24–240V AC/DC ±10% 1m (3.3ft) (1.3mm sq.) 42BC–B1CRAL–T4
30mA (DC) 3 (250V AC,
3A C, 750V
750VA)) conductors
—
15mA (AC) 3A (30V DC, 90W)
2m (6.6ft) 30ms 42BC–B1CRAN–T4

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