I/O modules are electrical components used for device communication, device control and operation timing. They can connect directly to external loads like sensors, actuators, motors and valves to send and receive feedback to a control system when the load is energized. They can also be used as accessory devices for PLCs and HMIs.
Modern I/O modules are compatible with advanced industrial communication protocols, built with Ethernet ports and supporting TCP/IP, Modbus, Sixnet, ARP, UDP, HTTP and many other network modes. I/O modules typically offer RS-485 serial and USB connectivity as well.
Simple modules will use pin connectors and provide feedback for up to four circuits. More complex equipment can swap between and automatically configure several channels, with programmable feedback states.