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

Thu, 24 October 2024 08:53

Eclipse User

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

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

Thu, 24 October 2024 17:58

Eclipse User

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

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

Fri, 25 October 2024 09:27

Eclipse User

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

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

Fri, 25 October 2024 09:44

Eclipse User

Thanks, very clear explanation !

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

Fri, 25 October 2024 17:55

Eclipse User

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.

Re: "Internal FBs" in a Basic Function Blocks [message #1872446 is a reply to message #1872195]

Thu, 31 October 2024 06:15

Eclipse User

Hallo Alois!

Thank you a lot! I'll try. Do I need to use some new version of FORTE source files either?

Re: "Internal FBs" in a Basic Function Blocks [message #1872479 is a reply to message #1872446]

Fri, 01 November 2024 04:18

Eclipse User

Yes please use the latest 4diac FORTE source from our github repository. Here please use the freeze branch.

Re: "Internal FBs" in a Basic Function Blocks [message #1872485 is a reply to message #1872195]

Fri, 01 November 2024 09:33

Eclipse User

Thanks!