Allen-Bradley 1746-IB16 SLC 500 16-Point DC Sinking Input Module

Product Overview

When your SLC 500 system requires reliable digital input sensing, the Allen-Bradley 1746-IB16 provides a proven solution. This module delivers sixteen sinking input channels rated for 24 Volts DC, with an operating voltage range of 10-30VDC. Designed for general-purpose DC inputs, it interfaces seamlessly with limit switches, proximity sensors, pushbuttons, and auxiliary contacts. As part of the SLC 500 family, the 1746-IB16 mounts directly into any available I/O slot in a 1746 chassis, drawing only 0.050 A from the backplane at 5 VDC.

Technical Specifications Breakdown

Understanding key specifications helps you match this module to your application. The 1746-IB16 features 16 sinking inputs grouped into one common group. Its nominal input current is 8 mA at 24 VDC, ensuring consistent sensing with standard industrial sensors. The OFF-state voltage is a maximum of 5.0V DC, and the OFF-state current is a maximum of 1 mA, which prevents false triggering from leakage. Signal delay for both ON and OFF transitions is 8 ms, providing predictable response times for most discrete control tasks. Thermal dissipation per channel is 0.20 Watts, contributing to a total module dissipation of 3.6W.

Industry Applications

In manufacturing lines, the 1746-IB16 monitors the status of conveyor limit switches and operator pushbuttons, feeding real-time data to the SLC 500 processor. Its 8 ms signal delay suits high-speed sorting and packaging machinery where quick detection is critical. For material handling systems, the module reads proximity sensors on automated guided vehicles, ensuring accurate positioning. The sinking configuration simplifies wiring with common DC supplies, reducing installation time and potential errors.

Installation & Setup Guidance

Mount the 1746-IB16 into any available I/O slot of a 1746 chassis. Use the Removable Terminal Block for easy wiring and module replacement. Connect field devices using 1746-HT or 1746-HCA I/O cables. Ensure the wiring follows a sinking configuration: connect the positive side of the 24 VDC supply to the sensor common, and the sensor output to the input terminal. The module supports local installation in the same rack as the SLC 500 CPU or in a distributed chassis via a 1746 communication adapter such as Remote I/O or Ethernet modules. Status LED indicators on the front panel show the actuation of each input channel, simplifying troubleshooting.

Maintenance & Reliability

Routine inspection of the 1746-IB16 involves checking the LED indicators for proper channel operation and verifying that the terminal block is securely fastened. The module operates reliably in temperatures from 0 to 60 °C (32 to 140 °F) and 5-95% relative humidity. When not in use, store the module between -40 and 85 °C (-40 and 185 °F). Its tested operational shock rating of 30G and vibration tolerance of 2.5G at 57-200 Hz ensure durability in harsh industrial environments. The module offers electro-optical isolation tested at 1500V between input terminals and control logic for added protection.

Compatibility & Integration

The 1746-IB16 is compatible with any SLC 500 chassis and CPU. The number of modules you can install depends on the CPU's I/O memory capacity. It works in both local and distributed I/O configurations using 1746 communication adapters for Remote I/O or Ethernet networks. The module supports sinking wiring only, so verify your field devices match this configuration. For replacement or expansion, the 1746-IB16 integrates directly into existing SLC 500 systems without additional adapters.

Selection Guide & Purchasing Advice

Before purchasing the 1746-IB16, confirm your SLC 500 CPU supports the required number of input points. Verify that your field devices operate within the 10-30VDC range and use sinking outputs. The module uses 1746-HT or 1746-HCA connection cables, so ensure these are available. BluePLC Industrial stocks the Allen-Bradley 1746-IB16 and can advise on current lifecycle status and availability. Contact our team to verify compatibility with your specific SLC 500 configuration and to discuss bulk pricing or expedited shipping options.