Configured for 24 VDC digital signal acquisition in ControlLogix chassis systems, the Allen-Bradley 1756-IV32 (1756-IV32 Sourcing Input Module) provides 32-point sourcing input capability with grouped channel organization for controller-based monitoring applications.

Model Identification

The 1756-IV32 is a ControlLogix digital input module designed to monitor sourcing field devices connected to 24 VDC circuits. The module provides 32 input points arranged as two groups of 16 points.

The module receives field input signals and transfers input status data through the ControlLogix backplane for controller processing.

Hardware Specifications

Digital Input Signal Interface

The 1756-IV32 provides 32 digital input channels for sourcing field devices. Each input point accepts a 10 to 30 VDC signal and transfers the detected state to the ControlLogix controller.

The input channels are divided into two groups, with 16 points assigned to each group. This grouping allows field wiring organization based on application requirements.

The module is designed for DC input monitoring and does not provide output switching capability or field power generation.

ControlLogix Backplane and I/O Architecture

The 1756-IV32 communicates with the ControlLogix controller through the chassis backplane. The module uses the ControlLogix I/O architecture for deterministic input data exchange between field devices and the controller program.

The module requires 120 mA at 5 VDC from the chassis backplane power supply. The chassis power budget should be checked before adding the module to an existing configuration.

Allen-Bradley ControlLogix systems support I/O density scaling by combining multiple input and output modules within the same chassis. The total available module count depends on chassis size, controller configuration, and power supply capacity.

Industrial Control Compatibility

The 1756-IV32 belongs to the Allen-Bradley ControlLogix digital I/O family. It operates within the Logix platform architecture and exchanges process data through the ControlLogix backplane bus.

The module does not contain Ethernet/IP communication hardware, standalone firmware interfaces, or external network ports. Network communication is provided by separate ControlLogix communication modules installed in the same chassis.

Ordering Information

• 1 x Allen-Bradley 1756-IV32 ControlLogix Sourcing Input Module
• Catalog number: 1756-IV32
• Alternate reference: 1756IV32
• Revision reference: 1756-IV32/A
• Module function: 32-point digital sourcing input interface
• ControlLogix chassis, power supply, field wiring components, and controller are not included unless separately specified.

Installation Guidelines

Chassis Installation

• Install the module into a compatible ControlLogix chassis slot.
• Verify the chassis power supply capacity before installation.
• Use proper ESD protection when handling the module.
• Confirm the module is fully seated in the backplane connector.

Field Wiring

• Connect only compatible 10 to 30 VDC digital input signals.
• Separate DC input wiring from high-voltage power conductors.
• Use appropriate grounding and shielding practices for the control cabinet.
• Verify field device polarity before applying power.

Configuration

• Configure input tags and module parameters within the Logix controller environment.
• Confirm input grouping requirements before assigning field devices.
• Verify input status changes during commissioning.
• Check controller I/O communication status after installation.

Frequently Asked Questions

• How many input points does the 1756-IV32 provide?

  The module provides 32 digital input points arranged as two groups of 16 points.

• What input voltage range does the module support?

  The module accepts 10 to 30 VDC digital input signals with a typical 24 VDC field supply.

• Is the 1756-IV32 an output module?

  No. The 1756-IV32 is a digital sourcing input module designed for signal monitoring only.

• What is the backplane current requirement?

  The specified backplane current requirement is 120 mA at 5 VDC from the ControlLogix chassis supply.

• Does the module provide field device power?

  No. The module monitors external field signals and does not supply power to connected devices.

• Can the 1756-IV32 communicate directly over Ethernet/IP?

  No. The module communicates through the ControlLogix backplane. Ethernet/IP communication requires a separate communication module.

• Can the module be installed in any ControlLogix chassis slot?

  The module requires installation in a compatible ControlLogix chassis with sufficient available power capacity.

• Does the 1756-IV32 require firmware configuration?

  The module operates as part of the Logix platform and configuration is performed through the controller programming environment.