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Monitoring System Health with Alarms

Last Modified: June 28, 2018

Set rules that trigger alarm instances when a tag value meets certain conditions.

Before setting up an alarm, ensure you have created a tag for the value you want to monitor.
  1. In Tag Viewer, double-click the tag for which you want to create an alarm rule.
  2. Under Alarm Rules, click Create.
  3. Specify a name for the rule.
  4. Specify a tag path to search for.
    • To apply the alarm rule to one tag, specify the absolute path of the tag.
    • To apply the alarm rule to multiple tags of the same data type, use the wildcard character (*) to represent any number of characters in the path.
    The table below illustrates examples of each type of tag search path.
    Example Tag Search Path Result
    system1.Health.Disk.Total Searches for one tag, system1.Health.Disk.Total .
    *.Health.Disk.Total Searches for all tags ending with .Health.Disk.Total.
  5. Specify the data type of the tag(s) for which you are creating an alarm rule. The data type you specify must match the data type specified in the tag.
  6. Click Create.
  7. When an alarm rule triggers an alarm, you can clear the alarm, acknowledge it, or neither. The following table illustrates the alarm states that result from different actions you perform on an active alarm.
    Clear? Acknowledged? Resulting alarm state
    Yes, due to change in tag value Yes Alarm becomes inactive.
    Yes, due to change in tag value No Alarm stays active.
    Yes, due to user force clearing the alarm instance Yes (force clearing acknowledges the alarm) Alarm becomes inactive.
    No Yes Alarm becomes acknowledged but stays active.
    No No Alarm stays active.

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