Allen‑Bradley 1771‑OM AC Output Module Inquiry Item

Description

1771-OM is an 8-point AC digital output module of Allen‑Bradley 1771 series, compatible with PLC‑5 control system. It switches 120V AC field loads such as indicator lamps, relays and contactors according to the logic command sent by the PLC CPU. This module is a discontinued legacy spare part, widely used for maintenance and replacement of old automation production lines.

Specification

Model: 1771‑OM Brand: Allen‑Bradley (Rockwell Automation) Type: Digital AC output module Channel: 8 output points Rated voltage: 120V AC Backplane: 1771 I/O rack Certification: CE, UL Protection grade: IP20

Component and Fault Diagnosis

It includes output drive circuit, opto-isolation unit, status LED indicators, backplane gold finger connector and PCB substrate. Common faults: No output action, channel burnout, indicator not lighting, poor backplane contact, communication failure with PLC CPU.

Disclaimer

This spare part shall be installed, calibrated and maintained by qualified instrument technicians. Verify chassis compatibility and output wiring before commissioning.