RClem
Lifetime Supporting Member
I have a peculiar problem with an analog input. First off I'm using a CPU315-2 PN/DP and Wago 750-343 bus couplers via profibus. My analog input is a 750-466 4-20mA single-ended, connected to an IFM PN2021 pressure transducer scaled 0-2700 PSI.
I am also using a Wago 750-554 analog output to a PD6000 display. The problem I have is I am able to input the signal, transfer to a temp variable and then transfer that to the output module. The Display and transducer will read correctly. I also use the temp variable to perform a logic comparison to load/un-load pumps. What I am able to monitor from the input is absolute garbage. Sometimes it will read as a negative integer and/or other random numbers that do not follow a pattern. The odd thing is display will read correctly on the signal pass-thru. I have mocked this system up prior to installation on the bench and simulated the input with a current calibrator and everything worked correctly. Now that the system is installed I have this problem. I have attached the function in PDF form. Thanks for your time.
I am also using a Wago 750-554 analog output to a PD6000 display. The problem I have is I am able to input the signal, transfer to a temp variable and then transfer that to the output module. The Display and transducer will read correctly. I also use the temp variable to perform a logic comparison to load/un-load pumps. What I am able to monitor from the input is absolute garbage. Sometimes it will read as a negative integer and/or other random numbers that do not follow a pattern. The odd thing is display will read correctly on the signal pass-thru. I have mocked this system up prior to installation on the bench and simulated the input with a current calibrator and everything worked correctly. Now that the system is installed I have this problem. I have attached the function in PDF form. Thanks for your time.