Hi all,
We have a DI charm (24 VDC low side) connected to a pressure switch, but in diagnostics it is giving me a bad hardware error.
We have:
Replaced the CHARM
Replaced the terminal block
Tried this on a different channel
Removed the end device and checked the wiring.
I'm having a hard time grasping what causes this CHARM to see an error. If the device had failed, would it not just always sense an open circuit or closed circuit?
What causes a hardware error on a DI CHARM? We don't have line fault detection enabled. I've also come across this with two temperature switches in our plant.
Any input would be appreciated!
In reply to RickV:
In reply to Ryan Severson: