Experimental Physics and
Industrial Control System

On 11/7/19 10:00 AM, Aaron Brown via Tech-talk wrote:
> Hello,
> 
> I am using a Channel Access client to monitor a list of PVs.
> A few of them are temperature values that don't change frequently.
> However, I would like to receive a value from these PVs even if the value hasn't changed to ensure the sensor is still operational.
> Is there a way to do this?
> I read something about a "rate guarantee", but have seen no information about how to change it.
> Any help will be greatly appreciated.

It may be worth saying that this sort of verification is usually the
responsibility of an IOC.  A well designed EPICS driver will indicate
communications faults, or other read errors, with an INVALID alarm.
CA or PVA clients can (and should) look at the alarm severity
as well as the value of each monitor update.

There are of course specific cases where this really isn't enough.
eg. to drive a soft PID loop at a fixed update rate.

References:

I can't figure out how to change the rate guarantee... Aaron Brown via Tech-talk

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