Hello, I am entering the final stages of the PLC program using a Modicon Micro 612-03 I used a loop calibrator (4-20mA) to simulate the pressure transmitter before connecting it up to see if the program is working correctly.
Once I proved that the program was working correctly I connected the pressure transmitter up by providing an external power supply (24v) and also connected the loop which goes to the PLC to the device as well.
when i operated the system I was getting 4095 on the analog input which I believe to be full scale, which is not what it should be.
Im not entirely sure about the wiring which I have done I have been told that there needs to be a resistor put in the loop to control the input loop current at 4-20mA. But from looking at the PLC where the analog connects to internally there is a 250 ohm resistor??
Please help
Once I proved that the program was working correctly I connected the pressure transmitter up by providing an external power supply (24v) and also connected the loop which goes to the PLC to the device as well.
when i operated the system I was getting 4095 on the analog input which I believe to be full scale, which is not what it should be.
Im not entirely sure about the wiring which I have done I have been told that there needs to be a resistor put in the loop to control the input loop current at 4-20mA. But from looking at the PLC where the analog connects to internally there is a 250 ohm resistor??
Please help