Experimental Physics and
Industrial Control System

Emmanuel Mayssat <[email protected]> · Wed, 01 Nov 2006 09:49:02 -0800

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,

-- 
Emmanuel Mayssat
Cell: 650/793-0626
Lyncean Technologies, Inc.
"See the invisible"

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System