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Question about event management in forte [message #1851998]

Mon, 25 April 2022 13:05

K Y

Messages: 7
Registered: May 2021

Junior Member

Hi, 4diac team,

In the daily use of forte, I have some questions about how events are transferred and managed between function blocks? I read a lot of information and papers about IEC 61499. For a single function block, an event is actually an input with a value of 0 or 1. In the source code of forte, it may be "pa_nEIID".

However, how to realize the interaction of event flow between different function blocks, and the management and transmission of such events has always bothered me. I have seen the concepts of management model and event dispatcher in many places, but I haven't found the corresponding part in forte. Can you help me answer the relevant questions? Thank you.

Best wishes!

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Re: Question about event management in forte [message #1852010 is a reply to message #1851998]

Mon, 25 April 2022 18:40

Alois Zoitl

Messages: 1638
Registered: January 2014

Senior Member

Hi,

first of all an event is never a boolean. It is a trigger that an event occurred.

There are many different ways of implementing IEC 61499 runtimes. 4diac FORTE follows the approach described in the book "Real-time execution for IEC 61499" or my INDIN 2007 papers. The core class for managing the events is the EventChainExecutionThread.

I hope this helps.

Cheers,
Alois

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Re: Question about event management in forte [message #1852022 is a reply to message #1852010]

Tue, 26 April 2022 06:17

K Y

Messages: 7
Registered: May 2021

Junior Member

Hi,Alois

Thank you for your answer, which is very important to me. I need to study the relevant contents of "event" again. Thank 4diac for providing such an experimental platform.

With regard to the "event flow", I hope to realize the trace variable and its associated events over a period of time, and better understand how "events" occur and manage when interacting between different function blocks.

Thanks！

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Re: Question about event management in forte [message #1852024 is a reply to message #1852022]

Tue, 26 April 2022 06:32

Alois Zoitl

Messages: 1638
Registered: January 2014

Senior Member

Hi,

happy to help.

Quote:

With regard to the "event flow", I hope to realize the trace variable and its associated events over a period of time, and better understand how "events" occur and manage when interacting between different function blocks.

This sounds very interesting. Would be interested to hear more about that when you have some results.

Cheers,
Alois

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