Mitsubishi Electric FX1S-20MR-ES/UL Programmable Logic Controller

The Mitsubishi Electric FX1S-20MR-ES/UL is a compact programmable logic controller that combines the CPU, power supply, and 20 I/O points in a single unit for discrete I/O control and basic logic processing in small machines and standalone automation panels. Part of the FX1S series, it provides 12 digital inputs and 8 relay outputs (total 20 I/O), with relay-type outputs capable of up to 2 A per point. The 24–240 V AC/DC input range and a 85–264 V AC power supply support flexible installation, while RS-422 is used for programming and communication. The unit supports roughly 2,000 program steps and can be mounted on a DIN rail or panel, with an operating temperature range of 0°C to 55°C in industrial environments. Common applications include packaging machines, conveyor systems, small assembly equipment, HVAC control panels, and other basic process control tasks where Mitsubishi PLCs manage discrete inputs and relay outputs. Common replacements listed: Mitsubishi FX3S-20MR PLC, Mitsubishi FX1N-60MR PLC, and Allen-Bradley MicroLogix 1100 PLC.