Experimental Physics and
Industrial Control System

Christoph Schroeder via Tech-talk <tech-talk at aps.anl.gov> · Thu, 5 Mar 2020 11:52:38 +0100

Hello everyone,

I need to write a value via CA link on IOC boot which didn't seem to
work with PINI=YES.

I created a minimal example to investigate this:
Source:
record (longout, "TEST:longout") {
    field(OUT, "TEST:longin CA")
    field(VAL, "1")
    field(PINI, "YES")
}

Target:
record (longin, "TEST:longin") {
}

The documentation states, that the target fields PP attribute decides
whether to process the record or not for CA output links. This is the
case for the longin's VAL field:
field(VAL, DBF_LONG) {
    pp(TRUE)
    promptgroup("40 - Input")
    asl(ASL0)
    prompt("Current value")
}

What's strange is, that the CA link is invalid after initialization:
TEST:longout                   2020-03-05 10:34:03.097922 1 LINK INVALID
Of course I started the IOC running TEST:longin beforehand.

Processing TEST:longout afterwards will work as intended. Am I missing
something or do CA output links do not work on initialization in general?
I tested this with base R3.15.5 and base R7.0.2.1 whith two IOCs running
on the same machine, same behavior for both.

Thanks and best regards,
Christoph

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System