... & Alarming!x-Messenger- Expandable GSM/GPRS PLC incorporates a wide range of CPUs, expansions, ... practical set of I/O resources& easy to use configuration software tools. Multiple optional ... can directly work with humidity sensors, water level sensor, pressure transducers, flow sensors, smoke, gas, ... delays, pulse relay ,counters ,Watchdog function ,PI controller etc..Ø Logic functions-AND, OR, NOT, XOR ...