The MessagesType is used to define the object sending events. These events are used for errors, warnings and messages.
The MessagesType is formally defined in Table 54.
Table 54 – MessagesType Definition
|Subtype of the BaseObjectType defined in OPC 10000-5 i.e. inheriting the InstanceDeclarations of that Node.|
To differentiate between errors, warnings and messages on the interface, the following convention shall be used, with regard to the recommendations in OPC 10000-5:
Errors have a high Severity between 667 and 1000 and are using an AlertType.
Warnings have a medium Severity between 334 and 666 and are using an AlertType.
Messages have a low Severity lower or equal to 333 and are using a NotificationEventType.