Allen-Bradley 1746-IB32 SLC 500 32-Point 24VDC Sink Input Module

June 24, 2026 • 2 min read • wayne • News

Product Summary

The 1746-IB32 is a high-density 24VDC sinking input module for your SLC 500 system. It provides thirty-two discrete input channels to monitor switches and sensors. This module delivers reliable signal acquisition with a rapid 3ms delay for both transitions.

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Key Technical Specifications for Selection

The 1746-IB32 operates within a voltage range of 15 to 30VDC at 50°C. At 60°C, this range narrows to 15 to 26.4VDC. This module draws only 50 mA from the 5VDC backplane. Its total power dissipation is just 6.65 Watts for the entire module.

Solving High-Density Input Challenges

Engineers often need to monitor many field devices in a compact space. This module solves that problem with thirty-two sinking inputs in a single slot. It directly interfaces with switches, sensors, and auxiliary contacts. This reduces the total number of modules you need for your project.

Ensuring System Compatibility

The module works with any SLC 500 processor in the 1746 chassis. You can install it locally, in an expansion rack, or a remote chassis. Remember that slot 1 is always reserved for the controller. This flexibility allows for scalable and distributed system designs.

Critical Installation Requirement

This module does not support Removal and Insertion Under Power (RIUP). You must completely remove power from the chassis before installation. This step prevents damage to the module and the backplane. Always follow this procedure to ensure safe and reliable operation.

Removable Terminal Block Benefits

The 1746-IB32 includes a removable terminal block (RTB). This design allows you to wire the module away from the chassis. It also simplifies maintenance by letting you swap modules quickly. You can insert the RTB into another module of the same type without rewiring.

Performance and Isolation Details

The module provides 1500V AC isolation between the backplane and I/O. This isolation protects your controller from electrical noise and surges. The nominal input current is 5.1 mA at 24VDC. This ensures reliable detection of ON and OFF states from your field devices.