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  9. Remote Locking? Is it possible?

Remote Locking? Is it possible?

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09 Mar 2018 19:00 - 09 Mar 2018 19:02 #6129 by support
Replied by support on topic Remote Locking? Is it possible?
Hello.

OPC specifications do not have any standard way of doing this. Consequently, QuickOPC cannot do it in any "standard way" either, nor can any tool based just on the bare OPC standard.

There can be ways to do it when the server (PLC) "cooperates" and provides such locking using extra tags or other methods, but such approach would be vendor-specific, and you will need to ask the server/PLC vendor whether they provide anything like that.

Best regards
Last edit: 09 Mar 2018 19:02 by admin.

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09 Mar 2018 12:08 #6128 by lux1
Remote Locking? Is it possible? was created by lux1
Dear OPC Labs team,
My current situation is that I read some variables from a PLC Control and write modified versions of them back. Between the read and write it could happen that the value of the variable on the PLC Control already changed, I miss that information and write a new value down to the PLC Control. Is there some way of locking mechanism to remote lock variables and avoid this issue? or some "test and set" operation instead of writing with the following?
EasyUAClient.WriteValue(UAEndpointDescriptor endpointDescriptor, UANodeDescriptor nodeDescriptor, object value);

I'm currently using Quick OPC 5.2 since I need .Net4.0 compatibility

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  1. Forum
  3. Discussions
  5. QuickOPC-Classic in .NET
  7. Reading, Writing, Subscriptions, Property Access
  9. Remote Locking? Is it possible?
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