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
|
Attribute |
Value |
||||
|
BrowseName |
MessagesType |
||||
|
IsAbstract |
False |
||||
|
References |
Node Class |
BrowseName |
DataType |
TypeDefinition |
Other |
|
Subtype of the BaseObjectType defined in OPC 10000-5 i.e. inheriting the InstanceDeclarations of that Node. |
|||||
|
0:GeneratesEvent |
ObjectType |
AlertType |
|
|
|
|
0:GeneratesEvent |
ObjectType |
NotificationEventType |
|
|
|
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.