System events are forwarded to clients using the same mechanism as alarms. They are forwarded to all temporary and configured alarm recipients in accordance with the settings in the associated Notification Class objects.
Comparison with the alarm strategy
System events cannot be acknowledged or reset. A Confirmed Event Notification message is sent to all alarm recipients. The Notify_Type data field in the message defines that the event is a system event and not an alarm. Each alarm recipient that receives the Confirmed Event Notification is required to respond with a SimpleAck. If the SimpleAck is not received, the same mechanism comes into operation as for alarms.
Each system event has a message text assigned to it. For the system events related to the operating hours counter, a user-specific text can be set up in Xworks Plus (XWP). Predefined system texts are available for the other system events.