Overview
The Allen-Bradley 1771-IAD Series C is a 16-point discrete input module designed for the PLC-5 controller platform. This industrial-grade input module accepts both 120VAC (50/60 Hz) and 125VDC signal voltages, making it ideal for interfacing discrete field devices such as pushbuttons, limit switches, relay contacts, and solenoid status indicators. Built with optoelectrical isolation to protect the system circuits from electrical transients, the module delivers reliable signal acquisition for critical automation processes.
Key Features
- Sixteen (16) input channels compatible for 120VAC / 125VDC input voltage
- 1 green module active indicator and 16 red status indicators for system logic side indication
- Delay time jumper allowing selection between 5 milliseconds and 20 milliseconds for preventing false input detection
- Optoelectrical isolation for protection from electrical transients
- Receives power through the 1771 I/O chassis backplane with 195 milliampere backplane current requirement
- Series C configuration for legacy PLC-5 systems
Technical Specifications
Designed to accept AC and DC signal voltages such as 120VAC with frequency of 50/60 Hz and 125VDC. Input signal delays provide selectable filtering to eliminate false triggers from transient signals.
Typical Applications
Primarily used to interface discrete devices such as pushbuttons, switches of different varieties, auxiliary contacts from relays, contactors and other devices. The module is well-suited for:
- Machine control and operator interface logic
- Equipment status monitoring and alarm indication
- Process gate and interlock signal acquisition
- Legacy automation system upgrades and maintenance
Compatibility & Replacements
Compatible With
- 1771-A1B, A2B, A3B, A3B1, A4B, 1771-AM1 and AM2 chassis
- PLC-5 control systems
- 1771 product bulletin architecture
- Field wiring terminals and standard automation cabinet mounting
Replaces / Drop-In Replacement For
The 1771-IAD Series C replaces earlier versions of the same module. This module is compatible with most other Allen-Bradley products, save for the 1771-A1, 1771-A2, and 1771-A4. Verify exact compatibility with your system integrator before ordering.
Works With
- 1771 family I/O chassis and backplane
- PLC-5 ladder logic and RSLogix 5 programming software
- Standard 24V DC and AC field devices
- Industry-standard discrete sensor and switch technologies
