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<== Date ==> <== Thread ==>
Subject: pvdata structure not writing to other pvs
From: Pierrick M Hanlet via Tech-talk <tech-talk at aps.anl.gov>
To: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Fri, 23 Apr 2021 21:10:54 +0000
Hi all,
I'm running v7.0.3.1 on an SL7.8 machine.  I'm using structured data, with a sub-structure
called Control.  I know that the structure/sub-structure is being properly set by testing it
with a pvmonitor:
pvmonitor -r Control P:S12OFP
which yields:
P:S12OFP structure
    structure Control
        time_t timeStamp <undefined>             
            long secondsPastEpoch 0
            int nanoseconds 0
            int userTag 0
        short value 8

I want this Control value to populate another record which has the form:
record(longin,"PIP2IT-HPRF-SSR1-SSA2-00:OFP:ControlPVs") {
    field(DESC,"Trigger Control PVs from acnet device")
    field(SCAN,"Passive")
    field(INP,{pva:{pv:"P:S12OFP",
            field:"Control.value",
            proc:"CP"}})
    field(FLNK,"PIP2IT-HPRF-SSR1-SSA2-00:OFP:SetPVs.PROC")
}

However, this value doesn't change despite its input value changing.  Furthermore,
if I attempt to change it's value with:
caput PIP2IT-HPRF-SSR1-SSA2-00:OFP:ControlPVs
then get the error:
Old : PIP2IT-HPRF-SSR1-SSA2-00:OFP:ControlPVs 0
CA.Client.Exception...............................................
    Warning: "Channel write request failed"
    Context: "op=1, channel=PIP2IT-HPRF-SSR1-SSA2-00:OFP:ControlPVs, type=DBR_STRING, count=1, ctx="PIP2IT-HPRF-SSR1-SSA2-00:OFP:ControlPVs""
    Source File: ../oldChannelNotify.cpp line 160
New : PIP2IT-HPRF-SSR1-SSA2-00:OFP:ControlPVs 0
    Current Time: Fri Apr 23 2021 15:45:03.687389769

Thank you,
Pierrick

-- 
Pierrick Hanlet
Fermi National Accelerator
Accelerator Front End Controls
+1-630-840-5555 -- lab
+1-312-687-4980 -- mobile

"Whether you think you can or think you can't, you're right" -- Henry Ford
Replies:
Re: pvdata structure not writing to other pvs Johnson, Andrew N. via Tech-talk
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