Allen-Bradley/Rockwell Automation 1771-OBD Discrete output module

The Allen-Bradley 1771-OBD is a Sixteen (16) channel, non-isolated output module that is part of the 1771 Product bulletin. This module is especially compatible for use with the PLC5 product family, typically used for energizing DC powered electrical loads such as pilot lamps, relay coils, solenoid actuated devices and other devices. It has an output voltage range of 10-60 VDC with nominal voltage output of 48 VDC.

The 1771-OBD’s output channels are rated 2 A, resistive, not-exceeding 8 A per module and 0.2 A per pilot duty output. Each channel has minimum Surge current rating of 4 A per output for 10 ms, repeatable every 2 s and maximum of 25 A per output for 10 ms, repeatable every 2 s while the module’s minimum load current is 2.5 mA.

Technical specifications for 1771-OBD

ManufacturerRockwell Automation

Module TypeDiscrete output module

Part Number/Catalog No.1771-OBD

BrandAllen-Bradley

Series1771 Product Bulletin

No. of outputsSixteen (16) outputs

Operating Voltage Range10-60VDC

Nominal output voltage48 VDC

Output current rating per channel2 A per output resistive, not to exceed 8 A per module; 0.2 A per output pilot duty

Maximum Surge current4 A per output for 10 ms, repeatable every 2 s; 25 A per output for 10 ms, repeatable every 2 s

Minimum load current2.5 mA

Power Dissipation15.6 Watts

Thermal Dissipation53.3 BTU/hr

Compatible chassis1771 I/O chassis

KeyingBetween 10 and 12; Between 22 and 24

Field Wiring Arm1771-WH; 1771-WHF; 1771-WHFB

Wiring Arm Screw Torque7-9 inch-pounds

Number of Outputs16 Outputs

Voltage Category10 to 60 Volts DC, Source

DC Operating Voltage10 to 60 Volts

Backplane Current400 Miliamps

Max Continuous Current Per Output2 Amps

Max Continuous Current Per Module8 Amps

Wiring Arm1771-WH

CoatingConformal Coat

Data FormatBDC or Natural Binary

Typical AC Signal Delay (Off)45 (+/- 15) milliseconds

Typical DC Signal Delay (Off)50 milliseconds

MountingRack Mountable

The 1771-OBD’s On-state voltage drop is 1.5V dc; maximum Off-state leakage current of 0.5 mA; Output signal delay of 0.1 ms for Off to On transition and 0.2 ms for On to Off transition. It is mounted to any of the 1771-A1B through 1771-A4B I/O chassis except the 1771-A4 I/O chassis. It is compatible for use with the 1771-WH, 1771-WHF and 1771-WHFB Field Wiring Arms with tightening force requirement of 1.0 Nm (9 lb-in) and module keying of between 10 and 12 / 22 and 24. Appropriate signal wires for termination of output devices to each of the module’s channel ranges from 0.34-2.5 mm2 (22…14 AWG) solid or stranded copper wire with insulation rating of 120 °C (248 °F) or greater and maximum insulation thickness of 1.2 mm (3/64 in.).