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Description

The Allen-Bradley 1756-IA32 is a 32-point high-density discrete AC input module designed for the ControlLogix platform. This module provides reliable signal sensing for 120V AC systems, offering 32 independent inputs within a single slot of a ControlLogix chassis. It features programmable input filtering to help mitigate signal noise and bounce, ensuring robust performance in industrial control environments.

Features

• 32-point discrete AC input density for space-efficient cabinet design.
• Supports a nominal input voltage of 120V AC with an operating range of 74-132V AC.
• Programmable input delay times (9 ms or 18 ms) for flexible signal processing.
• Electronic module keying to prevent improper installation in the chassis.
• Integrated status indicators for clear visual diagnostics of input states.

Technical Specifications

Module Type	Discrete AC Input
Input Points	32
Operating Voltage Range	74-132V AC
Input Delay (Programmable)	9 ms or 18 ms
Backplane Current (5V)	165 mA
Power Dissipation (Max)	6.1 W @ 60 degC
Thermal Dissipation	20.8 BTU/hr
Off-State Current (Max)	2.5 mA

Installation Guidelines

• Ensure the ControlLogix chassis is powered down before inserting or removing the 1756-IA32 module.
• Use appropriate RTB (Removable Terminal Block) connectors for wiring; ensure all connections are secured to prevent intermittent faults.
• Maintain proper ventilation within the enclosure to ensure ambient temperature remains within the specified operating range, particularly as the module dissipates up to 6.1W.
• Follow standard ESD (Electrostatic Discharge) precautions when handling the module to prevent damage to internal circuitry.
• Ensure the module is fully seated in the chassis slot before engaging the locking mechanism.

FAQ

What is the primary function of the 1756-IA32?
This module serves as a digital input interface, converting 120V AC signals from field devices into logic levels compatible with the ControlLogix controller backplane.

Can I program the input delay?
Yes, the module supports programmable input delay times of either 9 or 18 milliseconds, allowing you to tune the input response to suit specific application requirements.

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