Mitsubishi Electric FX1S-20MR-001 Programmable Logic Controller

The Mitsubishi Electric FX1S-20MR-001 programmable logic controller is a compact PLC from the MELSEC FX1S family, designed for small-scale industrial automation and machine control. It is commonly installed in simple production equipment, conveyors, packaging machines, and test systems, delivering reliable logic processing with integrated digital I/O. Key specs include 20 total I/O points (12 inputs, 8 outputs), digital DC (24 V, sink/source) inputs, and relay outputs, powered from a 100–240 VAC supply. The unit provides 2K steps of program memory (EEPROM) and a built-in RS-422 communication port, with expansion limited to a fixed I/O design and no expansion modules. It supports basic high-speed counters and consumes about 20 W of power. For mounting, it can be installed on a DIN rail or panel mount, and it operates from 0 °C to 55 °C with storage from -20 °C to 75 °C; the enclosure carries an IP20 protection rating. Common replacements include Mitsubishi FX3S-20MR/ES, Mitsubishi FX1N-20MR, and Siemens LOGO! 12/24RCE.