Allen Bradley 1771-OQC Isolated DC Output Module

The 1771-OQC is an isolated digital output module developed for the Allen-Bradley PLC-5 system architecture. Operating at a nominal rating of 24 VDC across 8 dedicated output channels, this module controls field devices such as solenoids, relays, indicator lights, and motor starters while providing channel-to-channel electrical isolation to protect control networks against cross-talk and electrical noise.

Channel Isolation and Output Performance

Designed for switching high-density 24 VDC loads, the module provides individual galavanic isolation across its 8 output circuits. This construction prevents ground loops, reduces common-mode voltage disruptions, and ensures reliable operation in demanding industrial environments where field devices operate across separate power sources or distinct potential references.

Chassis Integration and Mechanical Mounting

The module installs into a single slot of any standard 1771 Universal I/O chassis, interacting directly with the system backplane. Its physical weight of 1.35 lbs (0.61 kg) reflects standard rugged industrial packaging, ensuring robust housing and long-term durability in stationary control cabinets and distributed I/O racks.

Frequently Asked Questions

Q: What function does optical isolation serve on the 1771-OQC module outputs? A: Channel-to-channel isolation prevents electrical noise and ground loops from transferring between independent output circuits, protecting sensitive PLC backplane electronics from field-side voltage transients.

Q: What operating voltage range does the 1771-OQC support? A: The module is designed to switch standard 24 VDC digital loads.