Mitsubishi FXON-40ER-ER Digital I/O Extension Unit for MELSEC FX Series

The Mitsubishi FXON-40ER-ER (FXON-40ER-ER) is a combined digital input and output extension unit designed for Mitsubishi Electric MELSEC-F series programmable logic controllers. Engineered to expand the I/O capacity of FX series automation architectures, this compact expansion block provides an additional 40 I/O points to support complex sensing and actuation tasks. The module integrates 24 digital inputs rated for 24 V DC operation alongside 16 digital relay outputs featuring normally open contacts. It operates as an equivalent configuration to the FX0N40ERESUL unit, delivering reliable signal handling and isolation between control logic and field devices. This digital I/O expansion block connects directly into MELSEC-F controller assemblies, enabling flexible scaling for discrete manufacturing equipment, packaging lines, material handling systems, and assembly machinery. The 24 V DC inputs interface seamlessly with external sensors, pushbuttons, and limit switches, while the electromechanical relay outputs switch external loads such as actuators, solenoids, contactors, and indicator lamps. Built for industrial control cabinets, the Mitsubishi FXON-40ER-ER ensures stable input/output processing, long-term switching durability, and simplified field wiring across diverse PLC automation applications.