Allen-Bradley 1756-IA32 ControlLogix 32-Point AC Input Module

Product Description

The Allen-Bradley 1756-IA32 is a 32-point AC input module designed for use with the ControlLogix platform, providing reliable digital signal interfacing for industrial control systems. This module accepts 120V AC input signals and offers high isolation integrity between input groups, making it ideal for applications requiring dependable AC signal monitoring in automation environments.

Technical Specifications

• Model Number: 1756-IA32

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Product Series: ControlLogix

• Product Type: AC Input Module

• Input Points: 32 (organized as two groups of 16 channels each)

• Voltage Category: 120V AC, 50/60 Hz

• Nominal Input Voltage: 120V AC

• Operating Voltage Range: 74…132V AC, 47…63 Hz

• Maximum Power Dissipation: 6.1 W @ 60°C (140°F)

• Isolation Voltage:

• 250V (continuous) — basic insulation, inputs to backplane

• 125V (continuous) — basic insulation, between input groups

• No isolation between individual inputs within a group

• Signal Delay (On/Off): Typically 10–20 ms

• Backplane Current: 120 mA @ 5.1V DC, 3 mA @ 24V DC

• Input Thresholds:

• Off-State Voltage (max): 42V AC

• On-State Voltage (min): 74V AC

• On-State Current (nominal): 12 mA

• Operating Temperature: 0°C to +60°C (32°F to 140°F)

• Storage Temperature: -40°C to +85°C (-40°F to 185°F)

• Relative Humidity: 5–95% non-condensing

• Mounting: ControlLogix chassis

• Shipping Weight: 1.5 kg (3.3 lb)

Key Features

• High-density 32-point AC input design for compact control systems

• Dual-group isolation for improved safety and fault containment

• Supports 120V AC operation with wide frequency tolerance (47–63 Hz)

• Compatible with all standard ControlLogix chassis and power supplies

• Ideal for monitoring contactors, pushbuttons, and limit switches in industrial systems

Application Scenarios

The 1756-IA32 is widely used in process and discrete automation systems, where reliable AC signal interfacing is required. It is suitable for:

• Factory automation and machine control systems

• Power generation and distribution monitoring

• Material handling and packaging machinery

• HVAC and building control systems

FAQ

Q1: Can the 1756-IA32 be mixed with DC input modules in the same chassis?
A1: Yes. The ControlLogix platform supports mixed module types within a single chassis as long as power and grounding requirements are met.

Q2: What are the recommended terminal blocks for wiring?
A2: The module supports removable terminal blocks (RTBs) such as 1756-TBCH or 1756-TBNH, sold separately.

Q3: Does this module provide diagnostic feedback?
A3: The 1756-IA32 includes LED indicators for each channel to display input status during operation.