I will have a pt100 RTD connected to a transmitter which will output 4 to 20 Ma. the two wires from the transmitter will connect to the analog input card 1769-IF4I/A The range will be 4 Ma = 0 and 20 Ma = 100 The units will be deg C.
sorry bout creating new thread you can move this to the old thread if you like.
I think what I need is a element to read the 4 to 20 Ma input converting to 0 to 100 deg C then I want to set alarm points Hi and Low to close a XIC bit that will turn on a coil to energise a relay mounted in a panel which will turn on a strobe light