How to find the minimum scan time for AC800m controllers Ex:PM864,PM861,PM866 ?...
Can you please be more specific: with scan time, do you refer to the time needed to scan ModuleBus I/O, any Fieldbus, or the Task Time for the Program Execution, or even the RoundTrip Time?
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It deppends of priority of your task,
if you have high priority per example you can have minimun 10 ms
but if have time critical, you can select 1 ms without problems.
Yes as mentioned above its totally OK.
But we have consider one more thing
OUR PLC Load should not exceed to much, that their is delay in PLC operations.
so check the cyclic load of CPU also and adjust the time(ms) accordingly.
We can take bydefault scan time for AC800M controllers. This one is depends on Cyclic Load ,Project Size also. But is better to keep the cyclic load by less tha 65% will give better result