Experimental Physics and
Industrial Control System

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") {}

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