I apologize - I thought that I have replied, but apparently I did not.

With Isolated set to true, each such EasyDAClient will have its own OPC-DA connection to the server. Whether this will cause the server to use more communication channels to the PLC - I cannot answer - it is up to the server, so you need to ask the server vendor, or test it out. In general, OPC servers should expect multiple (many) connections to them, and for this reason, optimize the access to the device and not create separate connections in this way.

But, I do not see why you should need *many* objects with Isolated = true. If the Writes are causing the problem, you can use one 'Isolated' EasyDAClient for such Writes.

Regards

Thank you.

By default, operations on the same target OPC server are serialized by QuickOPC, even if you invoke them from a different thread or on different EasyDAClient objects. In this respect, you are right, and this could be a reason why you are getting timeouts. BTW, 3 seconds are quite (maybe too) low.

If this kind of serialization is the issue, here is how to work around it: Set the Isolated property of the EasyDAClient ot 'true'. This causes it to use a separate connection to the target OPC server (separate from all other Isolated connections, and from the non-Isolated connection as well). Be careful - you can safely create quite a lot of EasyDAClient-s with Isolated = 'false', because they share the same target OPC server connection, but EACH EasyDAClient with Isolated set to 'true' will have its OWN connection. For this reason, you should think over the design carefully, and possibly share the same "isolated" EasyDAClient between the pieces of code/threads that actually benefit from using the same connection while keeping a separate EasyDAClient for other purposes.

Best regards

Hello,

the default timeout on the client side is 1 minute. Are you saying that when doing this big write, other operations block for that long?

Or, are we talking about some timeout on the server or device side? Can you describe the symptoms more precisely, and send the actual error message and exception details?

Base on that I will then provide further advise.

Thank you