Is there a way to associate events such as DataChangeFcn, RecordsAcquired, etc. along with the OPC Toolbox blocks in Simulink?

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MathWorks Support Team 2009-6-27

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I am looking into using the Simulink blocks that ship with the OPC Toolbox. However, I cannot see a way to access all of the OPC Toolbox callbacks in Simulink.

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Answer 1

MathWorks Support Team 2009-6-27

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Not all functionality of the OPC Toolbox is exposed in Simulink. Specifically, there is no support for logging data using the OPC Toolbox functions. Rather, since Simulink provides a mechanism for doing this, the blocks rely on Simulink logging (via To Workspace blocks, output ports or scope blocks, for instance).

It is worth noting that the OPC Read block makes use of DataChange events when the Read Mode is set to asynchronous. In this mode, data changes happen "in the background" and Simulink picks up the latest value of the items during each execution of the OPC Read block. We also use the ErrorFcn callback to trap and deal with errors in read, write or connection operations.