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The history alarm viewer shows the status of alarms generated through external device monitoring / internal variable monitoring in a table.
(1) Alarm file path
The history alarm file refers to a file that sequentially records alarms that have occurred. This file is a file that records alarms generated in [Global Event/Screen Event > External Device Monitoring/Modification Monitoring] and cannot be recorded arbitrarily by other methods. The format of this file is not open to the public, and the contents can be inquired only with the history alarm indicator, and the extension must be *.alm.
(2) Object symbol designation
When processing an action for a history alarm (for example, confirming a specific alarm or deleting an alarm) externally, if there are multiple history alarm indicators on one screen at the same time, distinguish which history alarm display is being processed. This is the symbol specified for
In order to actually add an alarm line to the history alarm display, it is necessary to set in advance which alarm occurs in which case.
In the 'external device monitoring' or 'expression monitoring' event, you can set the conditions and details to generate an alarm. (Events and Actions>Global Events or Screen Events)
Generating an alarm means adding the contents of the alarm to the end of the *.alm file. (The format of the file to be added is private.)