Siemens SIMATIC OpenPCS 7 - Quality Codes for OPC A&E; OPC A&E with Hierarchical Access; Differences between OPC A&E and OPC A&E with Hierarchical Access

6.5.8 Quality codes for OPC A&E
Quality codes
The quality code is required to check the status and quality of a message. The following table
shows the quality codes of OPC A&E.
Code Quality Status
0xC0 OPC_GOOD OK
0x40 OPC_UNCERTAIN Output if there are discrepancies, for example
with a late acknowledgment.
0x00 OPC_BAD Output if the connection to the
source is interrupted.
6.5.9 OPC A&E with hierarchical access
6.5.9.1 Differences between OPC A&E and OPC A&E with hierarchical access
Representation of messages with OPC A&E
The OPC A&E server supports "conditional events" and "simple events" during access to the
message system. With "conditional events", the message numbers are shown for each source.
Since an PCS 7 OS server can hold many more message numbers, it is hard to keep an
OpenPCS 7 interface
6.5 OPC Alarms and Events (OPC A&E)
OpenPCS 7
64 Function Manual, 05/2012, A5E02780178-02