Control Variable (CV) Health Bad

What does CVFaulted (Status1.2) mean?

This fault indicates that the Control Variable (CV) health is bad. This can be due to poor CV value quality, an invalid CV value, or a communication fault affecting the CV output. When true, CVFault indicates an error on the output module, and the PIDE instruction sets the appropriate bit in Status. The equivalent Sts_CVBad in the PPID instruction will also be set if Inp_CVIOFault is true.

• CV value quality is bad or invalid (e.g., Inf, -Inf, NaN)
• Communication fault with the CV output module
• Analog output module fault status indicates an error (Inp_CVIOFault = 1 for PPID)

Click steps to track your progress.

1. 1

   Verify the analog output signal from the CV output module (e.g., terminals) using a multimeter or process calibrator

2. 2

   Check the communication status of the CV output module in the I/O tree, looking for module faults

3. 3

   Confirm the CV output module is healthy and not reporting internal faults via its diagnostics

4. 4

   Verify that the Inp_CVIOFault input (for PPID) is not actively being driven high by external conditions or logic