Experimental Physics and
Industrial Control System

Mathias Steiner <[email protected]> · Tue, 12 Jun 2007 18:59:47 -0400

Learned Friends,
I have what I believe to be a very basic EPICS question.
I'm new to ioc programming, so bear with me, please.
Let "a" and "b" be analog input records, passive, initialized to 1.
On the same ioc as those two, define
record(calc, "answr")
{
  ...
  field(INPA, "a.VAL PP NMS")
  field(INPB, "b.VAL CP NMS")
  field(CALC, "A+B")
  ...
}
As the ioc starts up, the value of "answr" is 2, as expected.
My question is this:
When "a" is set to another value, does "answr" process?
Also, when "b" is set to a different value, does "answr" process?
In other words, does a change in the linked record lead to processing of
the linking record, and does it do so for both database links and
channel access links?
The reason I'm asking is that in my application, only the channel access
link causes "answr" to process, the database link doesn't, and we
couldn't agree on what was supposed to happen.
Cheers, and Thanks in advance,
-Mathias

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System