Allen‑Bradley 1771‑OBDS Digital Output Module

The Allen‑Bradley 1771‑OBDS is a discrete digital output module for Allen‑Bradley PLC‑5 1771 I/O chassis system. It converts internal logic signals from PLC‑5 controller into field switching signals to drive relays, contactors and other on‑site execution devices.

This module adopts opto‑coupler isolation design with short‑circuit and over‑current protection for each channel. It is a common spare unit for maintenance and retrofitting of legacy PLC‑5 industrial automation control cabinets.

Main Specifications

Brand: Allen‑Bradley; Model:1771‑OBDS; Type: Digital Output Module
Applicable System: PLC‑5 series with 1771 back‑plane chassis
Signal Type: Multi‑channel discrete digital output
Function: Logic signal output, opto‑isolation and field actuator driving
Installation: Slot‑mounted inside 1771 PLC rack
Operating Environment: 0℃ ~ +60℃, 5%‑95% RH non‑condensing
Certifications: CE, compliant with industrial PLC automation standards

Core Functions

Receive control logic instructions from PLC‑5 CPU and output switching drive signals.
Optocoupler isolation separates PLC internal circuit from field load side.
Built‑in channel protection prevents module damage caused by load short‑circuit.
Feed back output channel status to controller for equipment running monitoring.
Standard slot‑in structure supports quick replacement during on‑site maintenance.
Compatible with legacy AB programming software for output address configuration.

Application Scenarios

Legacy production line automation cabinets based on Allen‑Bradley PLC‑5 platform.
On‑site actuator control for metallurgy, chemical industry and water‑treatment plants.
Retrofit and spare replacement of legacy 1771 series PLC automation platforms.
Industrial control equipment overhaul and digital output channel fault repair projects.
Spare parts inventory for automation integrators and engineering contractors.
Global aftermarket spare supply for technical teams maintaining Allen‑Bradley industrial hardware.