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<== Date ==> <== Thread ==>
Subject: Re: channel and pv deadband
From: "Mezger Anton Christian \(PSI\) via Tech-talk" <tech-talk at aps.anl.gov>
To: "Johnson, Andrew N." <anj at anl.gov>
Cc: EPICS tech-talk <tech-talk at aps.anl.gov>
Date: Sun, 3 Oct 2021 08:26:25 +0000

Hi Andrew,


me again. Epics4 works now for me, everything solved with some hints of michael.


The problem of camonitor with specifying a deadband:


I got from camonitor the following. The multiple servers could be a problem, but I do not know how to get rid of it in my centos with virtualbox.

EPICS_CA_ADDR_LIST=localhost has been specified


I get after starting the softioc


 camonitor ACM:TEST:AO.{"dbnd":{"abs":1.5}}
ACM:TEST:AO.{dbnd:{abs:1.5}}   <undefined> 0 UDF INVALID
CA.Client.Exception...............................................
    Warning: "Identical process variable names on multiple servers"
    Context: "Channel: "ACM:TEST:AO.{dbnd:{abs:1.5}}", Connecting to: 10.0.2.15:5064, Ignored: osboxes:5064"
    Source File: ../cac.cpp line 1320
    Current Time: Sun Oct 03 2021 04:22:15.964251792
..................................................................
CA.Client.Exception...............................................
    Warning: "Identical process variable names on multiple servers"
    Context: "Channel: "ACM:TEST:AO.{dbnd:{abs:1.5}}", Connecting to: 10.0.2.15:5064, Ignored: localhost:5064"
    Source File: ../cac.cpp line 1320
    Current Time: Sun Oct 03 2021 04:22:15.964387808
..................................................................

when I do caput ACM:TEST:AO 1 I do not get a monitor

when I do caput ACM:TEST:AO 2 I get

ACM:TEST:AO.{dbnd:{abs:1.5}}   2021-10-03 04:24:03.931949 2

If it works for you, then I wonder what is going on.

many thanks





From: Johnson, Andrew N. <anj at anl.gov>
Sent: Sunday, October 3, 2021 12:27:02 AM
To: Mezger Anton Christian (PSI)
Cc: EPICS tech-talk
Subject: Re: channel and pv deadband
 
Hi Anton,

On Oct 1, 2021, at 8:14 AM, Mezger Anton Christian (PSI) via Tech-talk <tech-talk at aps.anl.gov> wrote:

The problem is with the deadband specified as filter with a channel or pv. My example:

record(ao,"ACM:TEST:AO") {
...
    field(DTYP,"Soft Channel")
...
    field(MDEL,"0.000000000000000e+00")
...
}

and withcamonitor ACM:TEST:AO.{"dbnd":{"abs":1.5}}

I only get update when I put a value outside the deadband

I can’t seem to replicate your issue. I’m using this database:

woz$ cat ~/db/analog.db 
record(ai, "ai") {}
record(ao, "ao") {}

Here’s me starting the soft IOC and writing to the records:
woz$ softIoc -d ~/db/analog.db 
Starting iocInit
############################################################################
## EPICS R7.0.6.1-DEV
## Rev. R7.0.6-23-g21e7e4ddfbfbcf8ca5c6-dirty
############################################################################
iocRun: All initialization complete
epics> dbpf ai 10
DBF_DOUBLE:         10        
epics> dbpf ai 0
DBF_DOUBLE:         0         
epics> dbpf ai 1
DBF_DOUBLE:         1         
epics> dbpf ai 1.49
DBF_DOUBLE:         1.49      
epics> dbpf ai 1.5
DBF_DOUBLE:         1.5       
epics> dbpf ai 1.501
DBF_DOUBLE:         1.501     
epics> dbpf ao 1.5
DBF_DOUBLE:         1.5       
epics> dbpf ao 1.501
DBF_DOUBLE:         1.501     
epics> dbpf ao 1
DBF_DOUBLE:         1         
epics> dbpf ao 0.1
DBF_DOUBLE:         0.1       
epics> dbpf ao 0
DBF_DOUBLE:         0

and here’s what my camonitor output looked like. I started it immediately after the softIoc, before the first dbpf command above:

woz$ camonitor 'ai.{dbnd:{abs:1.5}}' 'ao.{dbnd:{abs:1.5}}'
ai.{dbnd:{abs:1.5}}            <undefined> 0 UDF INVALID
ao.{dbnd:{abs:1.5}}            <undefined> 0 UDF INVALID
ai.{dbnd:{abs:1.5}}            2021-10-02 17:08:32.684729 10  
ai.{dbnd:{abs:1.5}}            2021-10-02 17:08:39.867667 0  
ai.{dbnd:{abs:1.5}}            2021-10-02 17:09:05.595295 1.501  
ao.{dbnd:{abs:1.5}}            2021-10-02 17:09:32.741622 1.501  
ao.{dbnd:{abs:1.5}}            2021-10-02 17:10:02.573699 0  

The first two lines that show the undefined timestamp and UDF/Invalid alarm give the initial channel values as zero, then after testing with 10 and 0 there were no monitors posted until the value went over the deadband.

If you’re seeing something different, can you post your complete output from camonitor?

- Andrew

-- 
Complexity comes for free, simplicity you have to work for.

Replies:
Re: channel and pv deadband Mezger Anton Christian (PSI) via Tech-talk
References:
channel and pv deadband Mezger Anton Christian (PSI) via Tech-talk
Re: channel and pv deadband Kasemir, Kay via Tech-talk
Re: channel and pv deadband Mezger Anton Christian (PSI) via Tech-talk
Re: channel and pv deadband Johnson, Andrew N. via Tech-talk
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