OPC browsing

Two types of OPC browsing, namely off-line OPC browsing and on-line OPC browsing, are supported by the ABCIP Communication Driver.

Note: For tag items defined as array data types in an item addition request, the OPC_E_BADTYPE error is returned when an OPC client does not specify the array data type or the VT_EMPTY data type. The only exception is when an OPC client specifies VT_BSTR as the requested data type for an item that is defined as VT_ARRAY|VT_UI1. In this case, the Communication Driver accepts the item addition and returns the data as VT_BSTR.