Experimental Physics and
Industrial Control System

James F Ross <[email protected]> · Wed, 20 Mar 2013 14:23:54 -0400

That worked!  For future reference, the $ALARMCOUNTFILTER goes after
the PV you want to set it for in the alarm handler configuration file.
For example:
CHANNEL        GROUP_A         variable_1        -----
$ALARMCOUNTFILTER  2 3

This will set it so that variable_1 alarms only if it receives finds
the variable's value outside it's alarm limits twice over a three
second period.
Thanks!
James

On Wed, Mar 20, 2013 at 2:02 PM, Andrew Johnson <[email protected]> wrote:
> Hi James,
>
> On 2013-03-20 James F Ross wrote:
>> Does anyone know how to build in a delay for a process variable so
>> that it won't alarm unless the value is in the alarm range for a
>> setable period of time?  For instance, I'd like to set a particular
>> variable so that it will alarm only if the value is below the LOW
>> alarm setting for one second or longer.  Is this doable either through
>> the alarm handler or the database file or would I have to go into the
>> source code and manually program in a delay?
>
> ALH can do this itself using $ALARMCOUNTFILTER, see
>
> http://www.aps.anl.gov/epics/EpicsDocumentation/ExtensionsManuals/AlarmHandler/alhUserGuide-1.2.15/ALHUserGuide.html#6_3_12
>
> In 3.15 you'll be able to configure the standard input record types to filter
> alarms too, but for now the solutions available to you are either to use
> ALH's $ALARMCOUNTFILTER or to do something a lot more complicated in a
> database or an snl program.
>
> - Andrew
> --
> There is no such thing as a free lunch.  When invited for lunch,
> it is best to check if you are there to eat, or to be eaten.
> -- Clive Robinson

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System