overview of the messages. The following figure shows an example of the display in an OPC
browser:
Representation of the messages with OPC A&E and hierarchical access
As of PCS 7 V7.0 SP1, you can use an OPC A&E server with hierarchical access in PCS 7.
The OPC A&E server with hierarchical access supports the following event types:
● Condition-related event
● Simple event
● Tracking event
With a "condition-related event," the source of the messages is determined by the area and
the source. The area can be a system area, a diagnostics area or an alarm hiding group. If the
"source" text block in WinCC is dynamic or not configured, the character string ""EventID xx"
is used for the source in OPC instead of this text. Here, "xx" represents the unique WinCC
message number. This syntax is used for the source in the Area Browser and for the message
itself. A tracking event occurs when an operation message is triggered in the system. The
following figure shows an example of the representation of a condition-related event in an OPC
browser. The "Condition" is shown in addition to "Area" and "Source":
OpenPCS 7 interface
6.5 OPC Alarms and Events (OPC A&E)
OpenPCS 7
Function Manual, 05/2012, A5E02780178-02 65
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