Configured for high-current DC load control in Allen-Bradley PLC-5 systems, the Allen-Bradley 1771-OBD/C (1771-OBD Digital DC Output Module) provides direct physical/electrical execution.
Suffix Breakdown & Model Matrix
1771: Universal I/O chassis-based hardware architecture for Allen-Bradley control platforms.
OB: Discrete DC output module design classification.
D: 10 to 60 VDC operating voltage range configuration.
C: Hardware revision C series designation.
Hardware Specifications
Parameter
Specification
Model
1771-OBD/C
Brand
Allen-Bradley
Origin
USA
Weight
1.55 lbs (0.70 kg)
Dimensions
Standard 1771 single-slot chassis module
Operating Temp
0 to 60 deg C
Power Consumption
2.0 W (400 mA at 5 VDC backplane draw)
Backplane Current
400 mA at 5 VDC
Output Channels
16 discrete outputs
Voltage Range
10 to 60 VDC
Output Current Rating
2.0 A per channel (resistive), 8.0 A maximum per module
Pilot Duty Rating
0.2 A per output
High-Density I/O Isolation and Backplane Determinism
The 1771-OBD/C module manages 16 solid-state DC output channels, executing rapid load switching for actuators, solenoids, and indicators within a single chassis slot. Integrated across EtherNet/IP and remote I/O deterministic network topologies, the internal switching drivers isolate backplane logic from inductive inductive-kick back transients and field-side line fluctuations, preserving backplane bus communication velocity and preventing logic resets during heavy inductive switching cycles.
Frequently Asked Questions
Q: What is the maximum continuous current capacity per channel on the 1771-OBD/C?
A: Each individual output channel supports up to 2.0 A resistive load current, provided the total module continuous current does not exceed 8.0 A.
Q: What is the backplane current draw for the 1771-OBD/C output module?
A: The module draws 400 mA at 5 VDC from the 1771 chassis backplane logic power rail.
Field Installation Guidelines
Ensure 1771 chassis backplane power and external 10 to 60 VDC field power supplies are fully de-energized prior to installing or servicing the module.
Align the module circuit board with the top and bottom card guides of the chassis slot, sliding it inward until the locking latches securely engage.
Wire external DC field loads to the designated 1771 field wiring arm terminals, ensuring reverse-polarity protection is implemented across inductive loads.
Route DC load cabling through dedicated wiring channels separate from high-voltage AC circuits and low-level analog input lines.
