Allen-Bradley 1746-IB32 SLC 500 Sinking DC Input Module 24V

Product Overview

The Allen-Bradley 1746-IB32 is a high-performance 32-point digital input module engineered for the SLC 500 small logic controller family. This module is designed to interface with 24V DC field devices in a "sinking" configuration, meaning current flows from the input device into the module. Its high-density architecture allows for 32 distinct input channels to be consolidated into a single slot, making it an ideal choice for systems requiring a high I/O count in a limited space. Built by Rockwell Automation, the 1746-IB32 delivers the ruggedness and reliability required for mission-critical industrial automation tasks.

Core Technical Advantages

High-Density I/O Expansion

The 1746-IB32 provides one of the highest point densities available for the SLC 500 platform. By offering 32 inputs in a single module, it enables engineers to significantly reduce the size of the PLC chassis or increase the available capacity for other specialized modules, thereby lowering the total cost of ownership.

Rapid Signal Processing

Equipped with a fast 3ms signal delay (OFF to ON), the module ensures that the controller receives field data quickly and accurately. This responsiveness is critical for high-speed automated processes where timing precision directly impacts production quality and machine safety.

Robust Industrial Design

Designed for the factory floor, the 1746-IB32 boasts a 30G shock rating and a wide operating temperature range from 0°C to 60°C. With an input impedance of 4.7 kΩ, it effectively filters out transient noise while maintaining a clear signal for the internal logic, ensuring stable operation even in electrically noisy environments.

Technical Specifications

Installation & Wiring Notes

• Wiring Configuration: This is a sinking module. Your field devices (sensors/switches) must be "sourcing" types that provide 24V DC to the module's input terminals.
• Common Terminals: Ensure all common terminals are properly bonded to the negative side of the 24V DC power supply to complete the circuit.
• Heat Dissipation: The module dissipates approximately 6.65W at full load. Ensure the SLC 500 enclosure has adequate ventilation to maintain ambient temperatures within the 0°C to 60°C range.

Technical FAQs

Q1: What does "Sinking" input mean for the 1746-IB32?

A1: It means that the 1746-IB32 provides the path to ground (negative) for the circuit. The external field device must "source" or provide the +24V DC signal to the module input.

Q2: Can I use this module with an SLC 5/01 or 5/02 processor?

A2: Yes, the 1746-IB32 is compatible with all SLC 500 series processors, provided the chassis power supply has sufficient current capacity for the backplane draw.

Q3: How many commons are shared between the 32 points?

A3: The inputs are generally divided into groups. For the 1746-IB32, please refer to the wiring diagram on the module door for specific terminal assignments to ensure proper grouping.