[Individual PLC Scan Time]

Has anyone come up with a good method to determine the scan time of a single PLC? I have used the servo clock to come up with a total time for all PLC's, but was looking for a method to calculate individual PLC's with more accuracy than a servo interrupt.

 

Thanks

[ACC24-E2A Encoder Count Error]

What constitutes an encoder count error?

 

I am tring to help troubleshoot an issue with a UMAC ACC24-E2A tied to an Incremental Quadrature Encoder. The installation has been functioning for ~2years and now started getting encoder count error faults (X:$078208,8) bit gets set.

 

The encoder, ACC24-E2A board, UMAC rack, encoder Isolator, and field wires.

 

Not sure what to check next, but would like to know exactly what the ACC24-E2A board looks at in determinining an encoder count error.

 

Thanks