Opto 22 IAC5 G1 AC Digital Input Module, 90–140 VAC, 5 VDC Logic Rugged Optically Isolated Voltage Sensing for Proximity, Limit, Float and Selector Switch Inputs

Opto 22 IAC5 G1 AC Digital Input Module for Reliable Voltage Sensing

The Opto 22 IAC5 is a G1 AC digital input module designed to plug into Opto 22 I/O racks and provide dependable ON/OFF sensing of AC voltage or switch contacts in industrial control systems. With optical isolation and built-in noise filtering, it delivers a clean logic-level signal to your controller while protecting sensitive electronics from field-side transients and interference.

Why It Helps
By combining rugged construction, high noise rejection, and optical isolation, the IAC5 helps ensure accurate status readings even in harsh, electrically noisy environments. The module senses the presence or absence of AC voltage or dry contact closures and translates those signals into a 5 VDC logic output that is easy for PLCs, PACs, or other Opto 22-based control systems to read. This reduces troubleshooting time, improves system reliability, and extends controller life.

Key Highlights

• G1 AC digital input design for Opto 22 racks
  The IAC5 is part of Opto 22’s standard AC input module line and plugs directly into G1 mounting racks, simplifying panel layout and wiring for distributed I/O.

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• Optically isolated logic output for equipment protection
  Optical isolation separates high-voltage field wiring from low-voltage logic, helping protect controllers and other electronics from voltage spikes and electrical noise while maintaining reliable communication.

• High noise rejection and clean switching behavior
  Integrated input filtering and a hysteresis amplifier provide stable, bounce-free switching so status points for motors, pumps, and process equipment are reported accurately, even in noisy environments.

• Optimized for common industrial switch types
  The module is suitable for sensing AC-powered proximity, limit, float, selector, push-button, toggle switches, and thermostats, making it a flexible choice for many signaling and interlock points.

• Compact plug-in form factor
  Its small, plug-in body and rack-mount connection save panel space and allow quick replacement or expansion without rewiring the entire cabinet.

Applications

The Opto 22 IAC5 is well suited for general industrial automation, machine control, and process systems where AC voltage or switch status must be monitored from devices such as limit and proximity switches, level and float switches, selector and push-button stations, toggle switches, and thermostats. Installed in a G1 I/O rack and integrated with Opto 22-based or other 5 VDC logic controllers, it provides a reliable, long-term solution for isolating and digitizing field signals in demanding environments.