Experimental Physics and
Industrial Control System

Hello all,

I have a calcout record that select the video multiplexer channel based
on the combination of inserted screen.
The calcout is being scanned at a rate of 10 sec.
So every 10 sec, my mux receive the command to set a channel at a given
value. Obviously this is true, even if the channel is already selected.

Q: How can I tell the calcout not to send any value on its out field ?
(i.e. if channelSelector NPP is already at given value, then do
nothing. ) ( field(CALC, "A=0?:1") ? if INPA is set at 0 then do nothing
otherwise put 1 on OUT field record)

I tried playing with the PROC field, but it seems that whatever value
you put in this field trigger processing of the associated record.

Thank you for your help,

The calcout record can also handle more complicated cases, in which the
value to be sent cannot also be used as the switch that determines
whether or not a value should be sent.  See
    www.aps.anl.gov/epics/wiki/index.php/RRM_3-13_Calcout
and check out the OCAL and DOPT fields

--
Tim Mooney ([email protected]) (630)252-5417
Beamline Controls & Data Acquisition Group
Advanced Photon Source, Argonne National Lab

References:

calcout without update Emmanuel Mayssat

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