What are the special features of the changed startup behavior of the OPC data access server with SIMATIC NET CD Edition 2006?
When OPC groups are activated, the OPC DA server loaded with SIMATIC NET PC software CD Edition 2006 is initially only able to return "OPC_QUALITY_WAITING_FOR_INITIAL_DATA=0x20" for items with VT_EMPTY-type data values.
Please ensure that your OPC client supports this return value. Otherwise, your OPC client application needs to be changed accordingly.
This return value is a valid value according to the OPC specification.