Experimental Physics and
Industrial Control System

On 1/8/23 19:41, Michael Davidsaver wrote:

So the "Scan rate '%s' is not achievable" warning can be ignored.  Almost...

oops.  My mistake.  The timer queue is not used for SCAN.  So this
warning can be ignored in that context.

There is a long standing oddity in the timer queue code where quantum/2 is subtracted from all
user provided delays.  This can result in a negative number, which is treated as 0 delay.

This oddity is relevant in some cases where a record field holds a delay
time.  eg. ODLY of calcoutRecord, or HIGH of boRecord.

References:

Scan rate '.01 second' not achievable Barrett (US), Patrick E via Tech-talk

Re: Scan rate '.01 second' not achievable Érico Nogueira Rolim via Tech-talk

Re: Scan rate '.01 second' not achievable Michael Davidsaver via Tech-talk

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