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OPC CLIENT

Summary
The DeviceXPlorer supports OPC Client Interface, so it is able to connect to OPC server made of the other companies. DeviceXPlorer wraps the OPC Server made of the other companies that corresponds only to a part of interface of OPC DA. And offers a complete server function in accordance with the OPC specification to the client.


Applicable OPC Server
Interface Version
OPC DA (DataAccess) 2.05A


Require Interfaces of OPC Server
OPC Client use following interfaces. OPC Server need to implement thease interfaces.
Object Interface Need Note
OPC Server Object IOPCCommon o
IOPCServer o
IConnectionPointContainer o
IOPCItemProperties o
IOPCBrowseServerAddressSpace o
IOPCServerPublicGroups -
IPersistFile o
OPC Group Object IOPCGroupStateMgt o
IOPCPublicGroupStateMgt -
IOPCItemMgt o
IOPCSyncIO o (If necessary) This interface is used for Synchronous Read and Write.
IOPCAsyncIO -
IOPCASyncIO2 o (If necessary) This interface is used for Asynchronous Read and Write.
IConnectionPointContainer o
IDataObject o
IEnumOPCItemAttributes o
o : This interface is needed.
- : This interface is not needed.
o(If necessary) : This interface is needed if necessary.

OPC DA Client connection supports below interface. If the OPC Server doesn’t support below interface, you can’t use a part of function.
Object Interface Need Note
OPC Client Interface IOPCDataCallBack o (If necessary) This interface is used for ”DataChange Event”.
IOPCShutdown o (If necessary) This interface is used for ”OPC Server Shutdown Event”.
o(If necessary) : This interface is needed if necessary.


Available Items
Item Type Variant of value Description
Bool VT_BOOL Logical values
Byte VT_I1 8-bit signed integers
UByte VT_UI1 8-bit unsigned integers
Short VT_I2 16-bit signed integers
UShort VT_UI2 16-bit unsigned integers
Long VT_I4 32-bit signed integers
ULong VT_UI4 32-bit unsigned integers
Float VT_R4 32-bit real number
LongLong VT_I8 64-bit signed integers
ULongLong VT_UI8 64-bit unsigned integers
Double VT_R8 64-bit real number
String VT_BSTR Character string
Array of Bool VT_ARRAY | VT_BOOL Array of Logical values
Array of Byte VT_ARRAY | VT_I1 Array of 8-bit signed integers
Array of UByte VT_ARRAY | VT_UI1 Array of 8-bit unsigned integers
Arrya of Short VT_ARRAY | VT_I2 Array of 16-bit signed integers
Array of UShort VT_ARRAY | VT_UI2 Array of 16-bit unsigned integers
Array of Long VT_ARRAY | VT_I4 Array of 32-bit signed integers
Array of ULong VT_ARRAY | VT_UI4 Array of 32-bit unsigned integers
Array of Float VT_ARRAY | VT_R4 Array of 32-bit real number
Array of LongLong VT_ARRAY | VT_I8 Array of 64-bit signed integers
Array of ULongLong VT_ARRAY | VT_UI8 Array of 64-bit unsigned integers
Array of Double VT_ARRAY | VT_R8 Array of 64-bit real number




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