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.
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.).