Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Fri, 22 Nov 2013 11:16:01 -0600

Hi Lewis,

On 11/22/2013 10:53 AM, J. Lewis Muir wrote:

EPICS Base developers, it would be great if a write to the calcout VAL
field did trigger record processing.  But maybe there's a reason why it
doesn't?

I didn't design that record type, but why would you want to be able to

write a value to a field when that value is normally going to be

immediately overwritten when the record processes? Note that the

pp(TRUE) setting only applies when doing a put through CA, a database

link can directly control whether processing happens or not.

In this particular case you're getting clever with the record so I do

understand the request, but the ability to access the VAL field from a

Calc expression is a lot newer than the calcout record. Note also that

in an OCAL expression, VAL actually returns the last value from the OVAL

field, not the VAL field, so setting OCAL to "1000 * VAL" would not do

the scaling of the VAL field that Benoit wants it to do.

- Andrew
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System