yuckitypluckity
Member
I have a system with a 1769-OF4CI that sends signals to I to P devices that drive control valves. Recently I ran into an issue with one of the outputs where the operator would command the valve to be open X% and the actual output at the I to P would be lower than X by more than 10%. The highest output I could get at the I to P was like 16.8mA. The OK light is on for the module and I have hooked the wires up to spares on the card and get the same result.
When I remove the wires from the Analog Output module and drive the signal with a process meter the I to P works as expected and matches the % I am driving. It's only when I hook the circuit back up to the module that I experience the current drops.
What are ways I can troubleshoot the module to see if it is the problem? Can I measure the current coming out of the module while disconnected from the end device?
When I remove the wires from the Analog Output module and drive the signal with a process meter the I to P works as expected and matches the % I am driving. It's only when I hook the circuit back up to the module that I experience the current drops.
What are ways I can troubleshoot the module to see if it is the problem? Can I measure the current coming out of the module while disconnected from the end device?