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"Internal FBs" in a Basic Function Blocks [message #1872165]

Thu, 24 October 2024 12:53

Guido Piasenza

Messages: 17
Registered: October 2024

Junior Member

Dear Experts,

I am defining a Basic Function block starting from the template.

In the "Properties" tab of the new function block there's a sub-tab called "Internal FBs". Here I found I can add function blocks from the library.

My question is: how do I use these blocks ? I imagined I would be able to use it inside a function, such as "internalBlockInstance.IN = TRUE;", however this does not seem to work.

Can anyone shed some light ?

Thanks
Guido

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Re: "Internal FBs" in a Basic Function Blocks [message #1872195 is a reply to message #1872165]

Thu, 24 October 2024 21:58

Alois Zoitl

Messages: 1639
Registered: January 2014

Senior Member

Hi,

internal FBs is an idea that was translated from IEC 61131-3 to IEC 61499. Similar to IEC 61131-3 where internal variables of FBs can also be FBs we added this as additional list. You can call FBs in your algorithms like you can do that in IEC 61131-3.

We destinquish two different call types:

1. if the FB has only one input event:
internalFB(IN := TRUE, OUT => var3);

2. if the FB has more then one event the event name acts as method name:
internalFB.REQ(IN := TRUE, OUT => var3);
internalFB.INIT(QI := TRUE, QO => var2);

I hope this helps.

Cheers,
Alois

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Re: "Internal FBs" in a Basic Function Blocks [message #1872234 is a reply to message #1872195]

Fri, 25 October 2024 13:27

Maxim Kufeld

Messages: 3
Registered: October 2024

Junior Member

Hello everyone!
I'm trying to make a SimpleFB with ST algoritm. I use internal FBs (TON and R_trig in particular) like this:
TON0(IN:= Work, PT:= CommonSwitchTime, Q=> NeedSwitchPLS);
And when I'm trying to export the FB it shows an error of output variable Q:
Unhandled parameter types: [org.eclipse.fordiac.ide.model.structuredtext.structuredText.impl.OutArgumentImpl@5350383e (var: Q) (not: false)]
So I wonder whether my FB_TON instance call is written in a right way or do I miss something?

Thanks
Maxim

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Re: "Internal FBs" in a Basic Function Blocks [message #1872237 is a reply to message #1872195]

Fri, 25 October 2024 13:44

Guido Piasenza

Messages: 17
Registered: October 2024

Junior Member

Thanks, very clear explanation !

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Re: "Internal FBs" in a Basic Function Blocks [message #1872261 is a reply to message #1872237]

Fri, 25 October 2024 21:55

Alois Zoitl

Messages: 1639
Registered: January 2014

Senior Member

Hi Maxim,

this feature only works correctly in the preview versions of the upcoming release. Please use the 4diac IDE release you can get from here https://download.eclipse.org/4diac/updates/rc/
If you scroll down there are the zip files for the different platforms.

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