idle time for cpus used in dcs

Idle time is the spare time of a DCS CPU, it means that the DCS CPU has finished scanning its I/O state, program executions, and updates the I/Os, for example a DCS has 60 secs Idle Time and the total time that the CPU has finished scanning
and updating the I/O is 15 secs that means the that CPU of the DCS has 45secs left in his time or known as the Idle time.

Im sure you can understand what is it's significance.

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Cameron McDonald

It is significant if it goes down to zero!
Alarms are processed in idle time - so if you're having problems with alarms - and you have very little idle time you have problems.