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pub/sub state machine [message #1867425]

Tue, 25 June 2024 06:36

Eclipse User

Hi,
How can I find the state machine of a sub/pub FB in 4diac.
I would like to know in detail how a sub/pub FB works and what each input/output is used for.

Re: pub/sub state machine [message #1867428 is a reply to message #1867425]

Tue, 25 June 2024 07:19

Eclipse User

Publish and subscribe are service interface function blocks. For Service Interface function blocks there is now implementation in IEC 61499. Therefore also no state machine. These FBs are implemented spefic for a certain implementation e.g. in our case in 4diac FORTE with special C++ code.

The general behavior of Publish and Subscribe is defined in IEC 61499 Annex F as unidirectional communication interaction. That means that data inputs of Publish blocks are sent over a communication medium to a corresponding Subscribe block which is then puting the data on its output and notifies your application with an IND event. How that is done depends on your implementation and on your network.

For 4diac FORTE we have a set of different communication protocols and you can find how to use them and how they work in our communication documentation.

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