1756-IA16 | AB Allen Bradley | ControlLogix 16 Pt D/I 120V AC Module

Product Summary

The 1756-IA16 is a ControlLogix 16-point digital input module. It provides 16 inputs rated for 120 VAC for discrete signal monitoring in ControlLogix systems.

Core Specifications

• Catalog Number: 1756-IA16
• Module Type: 16-Point Digital Input Module (120 VAC)
• Compatible Platform: ControlLogix (1756 chassis)
• Input Points: 16 (one group of 16)
• Rated Voltage: 120 VAC nominal
• Input Voltage Range: 79–132 VAC

Electrical Characteristics

• On-State Voltage: 79–132 VAC
• Off-State Voltage: 0–20 VAC
• On-State Current: 5 mA minimum
• Input Delay Time: Configurable (typically 1–2 ms ON, 9–10 ms OFF)
• Isolation: 250 V continuous / 1500 V for 1 minute (group-to-backplane)
• Backplane Current: ~100 mA @ 5 VDC, ~2 mA @ 24 VDC (typical)

Installation Guide

1. Install the module in any slot of a 1756 ControlLogix chassis.
2. Use a removable terminal block (RTB) for field wiring (1756-TBCH or 1756-TBS6H recommended).
3. Configure the module in Studio 5000 Logix Designer for input filter times and diagnostics.
4. Verify operation using module status LEDs and controller diagnostics.

Selection Guidelines

• Select 1756-IA16 for standard 120 VAC digital inputs in non-isolated group configuration.
• For individually isolated 120 VAC inputs, consider 1756-IA16I.
• Ensure chassis power supply capacity supports the module’s backplane current draw.

Frequently Asked Questions