The Z-4TC-D measures up to 4 thermocouple sensors (J, K, E, N, S, R ,B ,T) through a PLC using digital input/output. The PLC interface is based on three PNP-type signals and is suitable for connection to most PLCs available in the market. The interface is composed of a CLOCK signal generated by the PLC (transistor output), a DATA signal and STROBE signal generated by the module.