6 PackML Data Representation Model ToC Previous Next

6.8 Alarms ToC Previous Next

6.8.1 Overview ToC Previous Next

The section defines alarms. Alarms in PackML are provided via a set of tags. Alarms in OPC UA are provided via events and a full alarming system. This is a preferred method for providing alarms, but it does require some additional overhead. To allow the PackML information model to be implemented in smaller devices it was decided to initially support the existing Tag based representation of Alarm information, and to add the OPC UA Event based definition of alarms in the next release. Servers shall be able to report alarms in both manners, and Clients can use the manner that is most appropriate for them. Some smaller device might find it easier to just access the tags for Alarm information, but display system or other HMIs would probably make use of the OPC UA Event based system for alarming.

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