Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Tue, 3 Mar 2015 17:43:21 +0100

On Monday 02 March 2015 12:55:47 Zenon Szalata wrote:
> But I still am confused.  I see that the longout record is not
> "really" processed; it did not write its VAL to the OUT link.

Exactly. This is the trick that makes it all work, since you don't
*want* the record to do a real write to the hardware. Writing normally
occurs in the first processing phase. This first phase never actually
happens, instead the device support writes the value it reads back from
the hardware into the record, sets PACT and then calls process. So the
record support *thinks* it being called for teh second time i.e. to
signal completion of the IO. It then does the rest of what we want,
namely setting the new severities etc.

We have been using the same method (for bumpless reboot) in our custom
MultiCAN device support for some years. It's tricky to get all the
details in the device support right but when you do it works perfectly.

Cheers
Ben
--
"Make it so they have to reboot after every typo." ― Scott Adams

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System