Seneca S20-1-ST PLC Processor

Seneca S20-1-ST is a compact batch controller designed for precise dosing and batch execution in process automation. As part of the S20N1 family, it features a 72×144 mm front panel with two 5-digit red LED displays, a seven-LED status cluster, and a six-key keypad for on-device programming and batch cycling; it accepts three digital inputs (start, stop, reset) plus one pulse input to trigger batch actions. The unit provides two SPDT relay outputs rated for up to 5 A at 250 V (resistive load) and is powered from a 115/230 V AC supply, enabling stand-alone operation or remote batch control via a Modbus interface. Available in standard, Ex, and IP65 variants, the S20-1-ST is positioned for economical batch control in environments where a compact, reliable controller is preferred.