Allen-Bradley 1746-IM4 SLC 500 AC Input Module 4-Point

June 24, 2026 • 3 min read • wayne • News

Product Summary

The Allen-Bradley 1746-IM4 provides four robust AC input points for your SLC 500 system. This module operates within a 170-265V AC range. It draws only 35 milliamps from the 5V DC backplane. This low power consumption makes it an efficient choice. Use it for general-purpose 125V DC input applications. It connects easily using 1746-HT and 1746-HCA cables.

Expert Technical Evaluation & Performance Review

The 1746-IM4 delivers reliable signal detection for industrial environments. Its input signal delay measures 35 milliseconds for the ON state. The OFF state delay is slightly longer at 45 milliseconds. This predictable timing ensures consistent system response. The module handles a nominal input current of 12mA at 240V AC. Each input point can surge up to 1.6A for 500 microseconds. This surge capacity handles inrush currents from connected devices. The maximum power dissipation for the whole module is just 1.6W. This low heat output simplifies thermal management inside the chassis. The module provides 1500V AC isolation between the backplane and I/O. This isolation protects the controller from high-voltage transients. The off-state leakage current stays below 2.0 milliamps. This prevents false ON signals from residual voltage.

Environmental Durability and Certifications

The module operates reliably in temperatures from 0 to 60 degrees Celsius. It functions correctly in 5 to 95% non-condensing humidity. Storage temperature ranges from -40 to 85 degrees Celsius. This wide range protects the module during shipping and downtime. The module meets NEMA ICS 2-230 standards for noise immunity. Electrical noise from motors and drives will not disrupt its operation. It holds UL-A196, CSA, and C-UL certifications for hazardous locations. This compliance allows installation in demanding industrial areas. The module withstands 30G of operational shock without damage. It also resists 2.5G of vibration at 57-500 Hertz. This ruggedness ensures long service life on vibrating machinery.

Installation and Wiring Guide

Install the module into any slot of a 1746 I/O chassis. Ensure the chassis power supply provides enough backplane current. The module requires only 35 milliamps at 5V DC, which is minimal. It draws zero current from the 24V DC backplane supply. Connect your AC input devices to the terminal block. Use either the 1746-HT or 1746-HCA cable for I/O connection. These cables provide secure and reliable wiring. The module accepts a wide operational frequency of 47-63 Hz. This range covers standard global power line frequencies. The maximum voltage loss in the OFF state is 50V AC. Verify your input devices can tolerate this voltage. The step response time is 100 milliseconds for inputs. The output step response is much faster at 2.5 milliseconds.