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

The Allen-Bradley 1746-IB16 is a robust SLC 500 input module. It provides sixteen discrete sinking input channels for your control system. This module accepts a nominal signal voltage of 24VDC. It operates reliably across a wide voltage range from 10 to 30VDC. Engineers use it to interface with switches and proximity sensors. The module draws only 0.05 Amps from the backplane at 5VDC. Its compact design fits any standard SLC 500 chassis. This makes it a versatile choice for expanding I/O capacity.

Expert Technical Evaluation & Performance Review

The 1746-IB16 delivers exceptional signal integrity for industrial applications. Each input channel features an 8-millisecond signal delay for both ON and OFF transitions. This ensures fast and predictable response times for your logic. The module supports a sinking wiring configuration only. It offers a maximum OFF-state voltage of just 5VDC. The OFF-state current is limited to a maximum of 1 milliamp. This prevents false triggering from leakage currents. The nominal input current is 8 milliamps at 24VDC.

This module provides excellent electrical isolation for system protection. It features electro-optical isolation tested at 1500 Volts. This isolation separates the input terminals from the control logic. It effectively protects your CPU from field-side voltage spikes. The module also meets NEMA standard ICS 2-230 for noise immunity. This ensures stable operation in electrically noisy factory environments.

The 1746-IB16 is built to withstand harsh industrial conditions. It operates effectively in temperatures from 0 to 60 degrees Celsius. It can also be stored in temperatures ranging from -40 to 85 degrees Celsius. The module handles up to 5% to 95% relative humidity without issue. It has a tested operational shock rating of 30 G. The module also withstands operational vibration of 2.5 G at 57 to 200 Hz. This durability guarantees long-term reliability in demanding applications.

Step-by-Step User & Installation Guide

Installing the 1746-IB16 module is a straightforward process. First, ensure your SLC 500 chassis is powered down. Select an available I/O slot for the module. Align the module with the chassis guide rails. Slide the module firmly into the slot until it locks. The module draws a backplane current of 85 milliamps at 5 Volts DC. Verify your power supply can handle this additional load.

Wiring the module requires attention to its sinking configuration. The 1746-IB16 has one group of sixteen inputs with a single common. Use a compatible 1746-HT or 1746-HCA wiring terminal block. Connect your 24VDC sinking field devices to the input terminals. Ensure the voltage range stays between 10 and 30 Volts DC. The module provides status LED indicators for each channel. These LEDs show the actuation state of every input. This feature greatly simplifies system monitoring and troubleshooting.

The module's removable terminal block allows for easy wiring and replacement. You can pre-wire the terminal block before mounting it to the module. This reduces downtime during maintenance or module swaps. The number of modules you can install depends on your CPU. Check your specific SLC 500 CPU memory for I/O limits. You can install the module locally or in a distributed chassis. It works with 1746 communication adapters for remote I/O or Ethernet.