Allen‑Bradley 1771‑IBN Digital Input Module

The Allen‑Bradley 1771‑IBN is a discrete digital input module designed for Allen‑Bradley PLC‑5 1771 I/O chassis system. It reads field digital switch signals and transmits status data to the PLC‑5 controller for logic judgment and automatic process control.

This module adopts opto‑coupler isolation design to suppress on‑site electromagnetic interference, supporting high‑speed signal state acquisition. It is a common spare part for overhaul and retrofitting of legacy PLC‑5 automation control cabinets.

Main Specifications

Brand: Allen‑Bradley; Model:1771‑IBN; Type: Digital Input Module
Applicable System: PLC‑5 series with 1771 back‑plane chassis
Signal Type: Multi‑channel discrete digital input
Function: Field switch signal acquisition, opto‑isolation and status data transmission
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

Collect on‑site limit switch, push‑button and relay contact digital signals.
Optocoupler isolation separates field circuit from PLC internal control circuit.
Transmit switch on‑off status to PLC‑5 CPU for logic program processing.
Support channel status detection for equipment fault diagnosis and alarm output.
Backplane bus connection enables quick plug‑in replacement for field maintenance.
Compatible with legacy AB programming software for I/O address configuration.

Application Scenarios

Legacy production line control cabinets based on Allen‑Bradley PLC‑5 platform.
Digital signal acquisition units for metallurgy, chemical and water‑treatment industries.
Retrofit and spare replacement of legacy 1771 series PLC automation platforms.
Industrial control equipment overhaul and digital input 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.