Allen‑Bradley 1771‑OBDC Digital Output Module

The Allen‑Bradley 1771‑OBDC is a DC digital output module for Rockwell PLC‑5 and 1771 I/O rack systems. It receives digital control commands from the PLC‑5 controller and outputs 24VDC discrete signals to drive field solenoid valves, contactors and indicator lights for sequence and interlock control.

This plug‑in chassis module provides channel status LED indicators and built‑in overcurrent protection. It is commonly stocked as spare parts for maintenance and retrofitting of legacy 1771 automation cabinets in manufacturing, water treatment and chemical plants.

Main Specifications

• Brand: Allen‑Bradley (Rockwell Automation); Model: 1771‑OBDC; Type: DC Digital Output Module
• Applicable System: PLC‑5 controller, 1771 series I/O rack platform
• Core Tasks: Digital command receiving, 24VDC discrete signal output, overcurrent protection, channel status indication
• Signal Interface: Field wiring terminal assembly, 1771 backplane connector
• Installation: Plug‑in slot‑mount on standard 1771 I/O chassis rack
• Signal Type: 24V DC discrete output for solenoid valves, contactors and field indicators
• Operating Environment: 0℃ ~ +60℃, 5%‑95% RH non‑condensing, industrial anti‑vibration grade
• Mechanical: Standard 1771 series module form‑factor, IP20 cabinet‑mount installation
• Certifications: CE, conforms to Rockwell legacy automation EMC requirements

Core Functions

• Receive digital control logic signals from PLC‑5 controller and convert them into 24VDC switch outputs to actuate field执行 devices.
• Built‑in overcurrent protection prevents circuit damage caused by field short‑circuit and overload faults.
• Front‑panel LED indicators display real‑time channel output status to assist field wiring check and daily fault diagnosis.
• Communicate with PLC‑5 CPU via 1771 backplane bus to realize automatic sequence control and safety interlock of production equipment.
• Chassis plug‑in design supports quick disassembly and replacement during maintenance of old automation control cabinets.
• Industrial‑grade circuit hardware ensures long‑term stable operation for renovation projects of end‑of‑life PLC‑5 control systems.

Application Scenarios

• Spare‑part replacement for legacy PLC‑5 automation cabinets in manufacturing, water treatment and chemical industrial sites.
• Discrete output hardware for driving solenoid valves, contactors and indicator lamps in 1771 I/O rack control systems.
• Maintenance backup inventory for renovation and after‑sales maintenance projects of end‑of‑life Rockwell PLC‑5 automation equipment.
• Matching digital output module cooperating with PLC‑5 CPU, 1771 chassis, terminal arms and digital input modules.
• Retrofit replacement for aged output modules with channel failure, output loss and protection action abnormal faults.

• Global aftermarket spare supply for automation maintenance teams maintaining Rockwell legacy industrial‑control equipment worldwide.