Configuration note:
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.

Note:
This return value is a valid value according to the OPC specification.