1756-IV32 Allen-Bradley ControlLogix 32-Pt Sourcing Input Module

1756-IV32 ControlLogix Sourcing Input Architecture

The 1756-IV32 is a high-density digital input module engineered for the ControlLogix platform. This module features 32 sourcing input points organized into two isolated groups of 16. It interfaces seamlessly with the 1756 chassis to provide reliable signal acquisition from field devices. Operating within a 10-30V DC range, the 1756-IV32 utilizes sourcing logic where the module provides the current path from the DC source to the input device. It is designed for industrial environments requiring high I/O counts in a compact single-slot footprint.

Technical Specifications

• Model Number: 1756-IV32
• Brand: Allen-Bradley / Rockwell Automation
• Series: ControlLogix
• Module Type: Digital Sourcing Input
• Number of Inputs: 32 Points (16 points per group)
• Operating Voltage Range: 10-30V DC (Nominal 12/24V DC)
• Backplane Current (5.1V): 120 mA
• Backplane Current (24V): 2 mA
• Input Impedance: 8.6 kΩ maximum at 30V DC
• Maximum Inrush Current: 250 mA
• Power Dissipation: 4.1 Watts @ 60°C
• Compatible RTBs: 1756-TBCH or 1756-TBS6H
• Isolation Voltage: 250V (Continuous)

Global PLC Spare HUB's Insight

The 1756-IV32 is a cornerstone for high-density I/O configurations. From our engineering perspective, its primary value lies in its configurable filter times and sourcing logic. Unlike sinking modules, the 1756-IV32 is ideal for systems where field sensors require a common positive rail. This module effectively reduces chassis footprint by offering 32 points in a single slot without sacrificing signal integrity or thermal stability in high-temperature environments.

Compatible Equipment & Industry Applications

• Chassis Compatibility: Fits all standard ControlLogix 1756 chassis racks.
• Field Devices: Compatible with sourcing (PNP) sensors, limit switches, and push buttons.
• Control Systems: Fully integrates with Studio 5000 Logix Designer for advanced filtering.
• Key Sectors: Automotive assembly, high-speed packaging, and large-scale water treatment facilities.

Diagnostics & Functional Capabilities

• Status Visualization: Front-panel LEDs display the real-time "On/Off" state of each individual input.
• Configurable Filtering: Users can adjust digital filters to eliminate electrical noise or contact chatter.
• Rapid Response: Nominal hardware delays of 350-540 microseconds ensure high-speed logic execution.
• Group Isolation: Two separate 16-point groups prevent cross-circuit interference.

Shipping & Professional Warranty

• Warranty: Guaranteed protection with a 12-month professional replacement warranty.
• Express Logistics: Rapid worldwide shipping via FedEx, UPS, and DHL.
• Dispatch Time: Orders are processed and shipped within 24 to 48 hours.
• Condition: Factory-standard protective packaging for secure global transit.

Professional FAQ & Procurement Guide

Does the 1756-IV32 include the Removable Terminal Block (RTB)?

No, the RTB must be ordered separately. You will need either the 36-pin 1756-TBCH (Cage clamp) or 1756-TBS6H (Spring clamp) to complete the installation.

What is the significance of the "Sourcing" designation for this module?

In this sourcing module, the current flows out of the module terminal to the field device. You must ensure your sensors are PNP/Sourcing types to function correctly with the 1756-IV32.

How do I prevent false "On" signals from high-leakage sensors?

Ensure the Off-state leakage current of your sensor does not exceed 1.5 mA. If it does, the 1756-IV32 may incorrectly register the input as active.

Can I configure different filter times for different inputs?

Filter times are configured at the module level within the Logix Designer software. Higher filter settings improve noise immunity but increase the total system response time.

What is the maximum operating temperature for the 1756-IV32?

The module is rated for operation up to 60°C (140°F). At this peak temperature, power dissipation is approximately 4.1 Watts, so ensure adequate cabinet ventilation.

Selection Guide

• Verify that your field device logic (PNP/Sourcing) matches the 1756-IV32 hardware.
• Check that your 1756 power supply has sufficient capacity for the 120mA draw on the 5.1V backplane rail.
• Confirm you have the correct 36-pin RTB for your wiring standard (Cage vs. Spring).
• Allocate a single slot in the ControlLogix chassis for this high-density module.

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