Experimental Physics and
Industrial Control System

Brian Bevins <[email protected]> · Wed, 03 Jan 2007 10:17:37 -0500

Luedeke Andreas wrote:
> 王伟珍 wrote:
> 
>> In alh, is there other sounds besides beeping when alarms are present. i.e can I set one sound for alarm minor severity, and another sound for major severity. And can the sound last a certain time then stop automatically?
>>  
>>
> Hi 王伟珍,
> there is no direct feature of the alarmhandler to support for
> a) playing a different sound depending on the alarm severity or
> b) to stop the acoustic alarm after a certain time.
> 
> But as Maren pointed out, you can launch commands on severity change.
> To set a command for all channels of a group, you need to put after the
> group definition:
> GROUP NULL Linac-Magnets
> $SEVRCOMMAND UP_INVALID ca_put ALIMA:ALARM 3
> $SEVRCOMMAND UP_MAJOR ca_put ALIMA:ALARM 2
> $SEVRCOMMAND DOWN_MAJOR ca_put ALIMA:ALARM 2
> $SEVRCOMMAND UP_MINOR ca_put ALIMA:ALARM 1
> $SEVRCOMMAND DOWN_MINOR ca_put ALIMA:ALARM 1
> $SEVRCOMMAND DOWN_NO_ALARM ca_put ALIMA:ALARM 0
> 
> You would need a server application that handles the beeping.
> 
> But this is a clumsy solution, because if you acknowledge the alarm, it
> will have no influence on the beeping.
> Of course you can have another panel to stop the beeping.
> At the SLS we have a similar scheme to provide "Alarm area overview
> screens":
> each major group writes the alarm state to a channel like in the example
> above.
> We run into problems if several instances of the same alarmhandler
> configuration are started and if alarms are disabled in one instance and
> not in the other.
> 
> If someone has a solution that handles alarm acknowledgements and/or
> multiple alh instances, I would be interested.
> 
> Happy New Year!
> Andreas
> 

We have been working on a system (for some time now) that handles
acknowledgments and multiple instances by adding a "$UASEVRPV" command
to the alh configuration. This allows a GROUP to set a PV based on the
highest unacknowledged severity in the group. We are still having some
problems with it so I have not released it.

It would still require a separate PV monitoring program to actually
sound the alarms as desired here.

-- 
Brian S. Bevins, PE
Computer Scientist / Mechanical Engineer
Thomas Jefferson National Accelerator Facility

     "Progress, far from consisting in change,
      depends on retentiveness. Those who cannot
      remember the past are condemned to repeat it."
                                         -- George Santayana

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System