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