When using OPC server V2 or V3¶

Required functions of the OPC Client	OPC Server V2	OPC Server V3	Hints
Support Win XP, Win 7 32Bit, Win7 64Bit, Windows Server 2003, Windows Server 2008	X	X
OPC client runs as service	-	X
Support Alarm/Event	-	X
Support AC500 HA	-	X
OPC-Performance	-	faster	Comparison with OPC Server V2 to V3: Transmission rate
Support VB, VBA OPC clients (Automation Interface, Automation Wrapper)	X	X	OPC Server V3 supports also VBA OPC Clients, but OPC Server V2 must be installed also because of an otherwise missing DLL
Resources friendly to old OPC clients, which support only the old OPC DA 1.0a (Async I/O 1.0a) groups.	X	X	See Hints Behavior OPC Server V3 via Interface IOPCAsyncIO
Simulation without AC500	-	X

Note

If several OPC clients are used at the same time, they must run in the same session.