Configured for high-density AC load execution in Allen-Bradley 1771 Universal I/O Chassis platforms, the Allen-Bradley 1771-OAN (1771-OAN Digital AC Output Module) provides direct physical/electrical execution.
Suffix Breakdown & Model Matrix
1771: Universal I/O platform hardware family for PLC-5 control systems.
OA: High-density AC discrete output module design.
N: Voltage class designation supporting 80 to 265 VAC field power operations (32-channel configuration).
Hardware Specifications
Parameter
Specification
Model
1771-OAN
Brand
Allen-Bradley
Origin
USA
Weight
1.50 lbs (0.68 kg)
Dimensions
Standard 1771 single-slot chassis module
Operating Temp
-25 to 60 deg C (-13 to 140 deg F)
Power Consumption
16.2 W maximum power dissipation
Backplane Current
800 mA at 5 VDC
Operating Voltage
85 to 264 VAC (80 to 265 VAC range, 47 to 63 Hz)
Output Channels
32 outputs (4 isolated groups of 8 channels)
Max Continuous Current
1.0 A per channel (at 30 deg C), 2.0 A per group, 8.0 A per module
Wiring Arm
1771-WH
High-Density I/O Isolation and Backplane Determinism
The 1771-OAN module maximizes chassis rack space through high I/O density scaling, mapping 32 AC output channels into a single backplane slot across four isolated groups. Built to interface with Profinet and EtherNet/IP deterministic networks via PLC-5 adapters, the internal solid-state output circuitry isolates line-side AC transients from control logic, preserving backplane bus communication velocity and preventing cross-group interference during full-load switching.
Frequently Asked Questions
Q: What is the backplane current draw for the 1771-OAN output module?
A: The module draws up to 800 mA at 5 VDC from the 1771 chassis backplane supply rail.
Q: How does operating temperature affect the maximum continuous current per channel?
A: Each channel supports up to 1.0 A continuous output current at 30 deg C, which derates to 0.3 A per channel at the upper operating ambient limit of 60 deg C.
Field Installation Guidelines
Isolate and disconnect all 120/240 VAC field line power and chassis backplane power before inserting or removing the module.
Slide the module into the designated slot of the 1771 chassis (models 1771-A1B through A4B) until the top and bottom card latches snap tightly.
Wire AC line power and output load circuits to the 1771-WH field wiring arm, maintaining independent power sourcing for each of the four isolated 8-channel groups if required.
Separate high-voltage AC field cabling from low-voltage DC signals and communication lines to reduce electromagnetic noise coupling.
