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EMC Monitoring Operations: Alarm Handler

V00-02 Jan 11 2000
Pierre-Alexandre Fischer
  • Alarm Handler

  • General
    The alarm handler tool is part of the Epics package. It relies on a configuration file which lists all the channels it has to watch. The channels are combined into groups in order to bring some clarity and navigability within the channel list.
    This configuration file is maintained by the Monitoring expert. In addition to a list of channel the configuration file also contains mask settings for each channels. These setting are hardwired and allow us to permanently mask some
    faulty channels we know about but can't fix right away. This configuration file is included by central babar monitoring into the central alarm handler. Any changes in this file are propagated to central monitoring as soon as the alarm handler is restarted.
    Starting the alarm handler
    There are two ways to start the alarm handler. The first one and easiest one is to click on the "ALH" button
    main display button to start alh
    from the main monitoring display. The second way is to source the script:
                                                            source ~paf/
    Basic features
    When the alarm handler is started a first window comes up:
    Alarm Handler Main Display
    If any alarm comes up, this button will turn Yellow (warning) or Red (Alarm). To get more information about the origin of the alarm click on the button to get the Channel window:
    Alarm Handler group display
    This window displays the main groups of channels: BB (Barrel Backward), BF (Barrel Forward), EC (End Cap),
    TR (Transition Boards), GEN (General). The box in front of the group name reflect the group's alarm status. If it is colored, the alarm is coming from this group. Clicking on the box will acknowledge the alarm and stop the beeping sound.
    By doing this you will not make the alarm disappear ! A colored area will remain in front of the group name as long as the alarm is valid. The "G" button provides guidance for each group or channel. Clicking on it will display a short description of the group or channel content. The "P" button will pop up the relevant Epics Display so that you can see the extent of the damage or take action. The chain of characters on the right of the channel or group describes the mask settings.
    An explanation of the different mask settings can be found at the bottom of the ALH display.
    To display the Group content click on the group name and an expanded view will come up:
    Alarm Handler group selection

    You can also expand the group tree to its maximum by selecting the "View" menu and clicking on "Expand All":

    Alarm Handler channel lists display
    You can see on the display the list of channel on the right side of the window. During Shutdown, when part of the detector is off, somme alarm might be on all the time. If you don't want hear beeps all the time you can stop the sound by clicking on "SilenceForever". Be aware that this is dangerous because you might miss real alarm. The button should NEVER by pressed when we are in normal operating mode.

    How to mask noisy channels
    Select the channel or group to mask by clicking on it's name:
    Alarm Handler how to mask 1 channel

    Then go to "Action" and select  "Modify Mask Settings" to get this window:

    mask menu window

    click on "NoAck". This will disable the notification for this alarm but it will still appear as alarm on the display. If you want to remove completely the alarm, click on Disable. In any case write which channels you masked in the logbook and/or in the shift report.


Last modified P-A Fischer  January 11 2000