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Old May 24th, 2018, 05:33 PM   #16
Robb B
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I misread the values,

motion group coarse update period is 32ms.

scan times average 500us, though max time was 5111us.

The servo update period is 2000 us.

The valve response time is around 240ms for a zero to 100% response.

I'm assuming that us means microseconds.

The controller is not the slowest thing in the loop by a large margin.
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Old May 24th, 2018, 06:54 PM   #17
Peter Nachtwey
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Quote:
Originally Posted by Robb B View Post
I misread the values,

motion group coarse update period is 32ms.
I am not familiar with how the group update works. Seems slow.

Quote:
scan times average 500us, though max time was 5111us.
If this is the PLC scan time then no problem

Quote:
The servo update period is 2000 us.
This is the coarse update 2000 microsecond or 2 ms. This is OK considering the valve is so slow..
Quote:

The valve response time is around 240ms for a zero to 100% response.
The valve is junk. You need to replace it.
You need finer resolution.
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