The Allen-Bradley 1771-OBD, also cataloged as the 1771-OBD Digital Sourcing Output Module, operates as a dedicated hardware component for discrete DC load sourcing execution within Allen-Bradley 1771 Universal I/O Chassis platforms.
Hardware Specifications
Parameter
Specification
Model
1771-OBD
Brand
Allen-Bradley
Origin
USA
Weight
0.94 lbs (0.43 kg)
Dimensions
Standard 1771 single-slot chassis module
Operating Temp
0 to 60 deg C (32 to 140 deg F)
Power Consumption
15.6 W maximum power dissipation
Backplane Current
400 mA at 5 VDC
Operating Voltage
10 to 60 VDC (48 VDC nominal)
Output Channels
16 outputs (DC sourcing)
Output Current Rating
2 A per output resistive (8 A max per module); 0.2 A pilot duty
Minimum Load Current
2.5 mA
Wiring Arm
1771-WH, 1771-WHF, or 1771-WHFB
High-Density I/O Isolation and Backplane Determinism
The 1771-OBD module supports high I/O density scaling across deterministic EtherNet/IP and remote I/O network architectures by packing 16 discrete sourcing channels into a single chassis slot. Designed to isolate field-side electrical switching noise from sensitive logic circuitry, the module maintains backplane bus communication velocity and stable signal timing during simultaneous multi-channel switching events.
Frequently Asked Questions
Q: What are the backplane current draw and internal power dissipation specifications for the 1771-OBD?
A: The module draws 400 mA at 5 VDC from the 1771 chassis backplane rail, with a maximum operational power dissipation of 15.6 W (53.3 BTU/hr thermal dissipation).
Q: What keying pin positions are required on the chassis backplane before inserting the 1771-OBD?
A: Install keying bands between pins 10 and 12 on the upper backplane connector and between pins 22 and 24 on the lower backplane connector.
Field Installation Guidelines
De-energize main chassis power and external 10 to 60 VDC field loop power before mounting or removing the module.
Align the module card edges with the top and bottom guide rails of the 1771 I/O chassis, pushing firmly until the locking latches seat tightly.
Terminate signal conductors (22 to 14 AWG copper wire) to the 1771-WH field wiring arm and tighten terminal screws to 7 to 9 inch-pounds (1.0 Nm).
Maintain separation between field DC signal cabling and high-voltage AC power lines to prevent induced noise and false output triggering.
