Maximum number of alarms in storage (Alarm Manager)

what is the maximum limit allowed to set the Alarm Storage in 800xA? The manual indicates that 10000 is the default value, but there must be some limit. Can anyone help me?

Alarm Storage.jpg

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mscarillo Rank: 258

Asked 4 years ago

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Unfortunately there is no official figure available.

However, with the "Make new alarm each time a condition gets active" setting disabled (which is default) the default capacity of 10.000 (=19 clicks on the "Next page" in an unfiltered alarm list where each page list 500 alarms) should be enough for most configurations.

I do, however recommend declaring separate alarm storage for system alarms since most installations care more for process alarms than system alarms. E.g. with a large amount of AC800 IO and the typical many many "underflow/overflow" alarms due to active, but unconnected IO loops the storage of process alarms might be threatened.

I also believe going a bit further than 10.000 is OK.

For "alarm history" I suggest using event lists; the event storage service can store up to 50.000 events per event category (10.000 is default setting). Unlike alarms, events are retained across system restarts, cold reset of controller, etc.

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