The TCS series is a low cost method of go/no go current detection. It includes a solid state output to sink or source current when connected directly to a standard PLC digital input module. Its normally open or normally closed output can also be used to control relays, lamps, valves and small heaters rated up to 1 A steady, 10 A inrush. The TCS is self-powered (no external power required to operate the unit).