Allen Bradley 1771-ICD | PLC-5 DC Digital Input Module | 16-Point

Product Description

The Allen Bradley 1771-ICD is a 16-point DC digital input module designed for use with PLC-5 systems. It accepts signals in the 20–60 V DC range and converts them into logic-level inputs for processor recognition. With opto-isolated channels, input filtering, and diagnostic LED indicators, this module ensures reliable signal acquisition and enhanced noise immunity in industrial automation environments.

Technical Specifications

• Manufacturer Allen Bradley

• Product Line PLC-5 Series

• Product Type DC Digital Input Module

• Catalog Number 1771-ICD

• Number of Inputs 16 channels

• Input Voltage Range 20–60 V DC

• Nominal Input Current 2 mA @ 20 V DC, 6 mA @ 60 V DC

• Minimum On-State Voltage 20 V DC

• Maximum Off-State Voltage 12 V DC

• Maximum Off-State Current 1.2 mA

• Input Impedance 10 kΩ max

• Signal Delay (ON) 6 ± 2 ms

• Signal Delay (OFF) 20 ± 1 ms

• Backplane Current 250 mA @ 5 V DC

• Power Dissipation 1.3–5.9 W

• Thermal Dissipation 4.3–19.93 BTU/hr

• Isolation Voltage 1500 V AC (rms)

• Wiring Arm 1771-WN

• Mounting Rack-mountable in 1771 I/O chassis

• Operating Temperature 0–60 °C

• Storage Temperature –40–85 °C

• Humidity 5–95% RH, non-condensing

Functional Highlights

• Converts 20–60 V DC signals into logic-level inputs

• Opto-isolated channels for improved noise immunity

• Input filtering to suppress contact bounce and transients

• LED indicators for individual input status

• Supports both 2-wire and 3-wire input device configurations

• Fault mode jumper for last-state or reset behavior

• Compatible with Series B 1771 chassis (A1B–A4B, AM, AM1)

Application Scenarios

• Industrial automation systems requiring reliable DC input conversion

• Legacy PLC-5 installations needing 16-channel input capacity

• Environments with electrical noise where opto-isolation is critical

FAQ

Q: What voltage range does the 1771-ICD support?  A: It accepts DC signals from 20 V to 60 V.

Q: How many input channels are available?  A: The module provides 16 opto-isolated input channels.

Q: Is the module compatible with all PLC-5 chassis?  A: Yes, it can be mounted in any 1771 I/O chassis, including Series B models.

Comparable Models

• 1771-ICD: 16-point DC input module (this model)

• 1771-IFE: Analog input module for voltage/current signals

• 1771-IR: Resistance input module for specialized sensor applications