When an alarm is triggered, it becomes active. The active state of a digital alarm is ON, while the active state of an analog alarm varies, depending on the type of alarm (for instance HIGH, LOW , RATE, and so on). When an operator acknowledges the alarm, its state changes to ACKNOWLEDGED. When the alarm is reset (when the conditions that caused the alarm have been rectified), its state changes to OFF.
Alarms are displayed on the standard alarm display pageThe alarm display page displays alarm information in the following format: Alarm Time, Tag Name, Alarm Name, Alarm Description.. To acknowledge an alarm, an operator either selects the alarm with the mouse and clicks the left mouse button, or moves the cursor onto the alarm and presses the Enter key. Alternatively, the operator can acknowledge every alarm by clicking Alarm Ack. When an alarm is acknowledged, its display color (on screen) changes. Acknowledged alarms remain on screen until their state changes to OFF.
If an alarm does not appear to be operating as
designed, or is deemed unnecessary, an operator can disable it.
Disabled alarms are ignored until they are re-enabled. (You need to
define a command that uses the
AlarmDisable() function to disable alarms.)
To maintain a history of alarm activity, an event log is kept of alarms. This log stores the time when each alarm was activated, acknowledged, and reset. You can display alarms from the event log (including disabled alarms) on the alarm summary page.
Create a page called Summary
based on the AlarmSummary template. call the page "Summary" so that
the alarm summary button (on pages such as the menu page) operates
function can only open a page called "Summary").
Operators can add comments to any alarm in the
summary log. (You need to define a command that uses the
AlarmComment() function to add
comments to an alarm.)
Note: If you have many alarms on the alarm page or alarm summary page, use Page Up and Page Down to scroll through the list.
To create an alarm page:
- or -
Note: You can also create your own (non-standard) alarm pages. The easiest way to do this is by copying and modifying the standard alarm templates.
To display an alarm page at runtime:
Note: If using the standard page templates, you don't usually need to create a command to display the page: the commands are already built in.
To display a customized alarm page (with a
non-standard name), use the
PageDisplay() function to display the page,
followed by the
function as necessary.