How to create script if a property is changed?

Hello Denilson,

Can you give us a sample how to create script if a property is changed?

Maybe I don't understand correctly how supposed to work, but I expect if the property is changed, my script to be executed. I tried with a simple Tag to set but isn't work.

Maybe I do it something wrong but in this case, I expect when I click on my on my object to change the property and to set my tag.

Please help me.

Thanks.

Gabi

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Split from Simple Sample and TIPs - WinCC Unified - Dynamization of graphic objects.

Hello,

Thank you for your fast response. I know your example because I checked before I post my question.

I understood that the in your example if you move the slider the value of "HMITag_1" is changing and this is also the TRIGGER of the script.

The difference what I don't really understand is, that in my case what is the TRIGGER. I still try to use the "OnPropertyChanged" function (without success). So this is why I want to understand how supposed to be triggered those scripts.

 Thanks.

 Hello Stefan,

First of all, thank you for your hints.

I am starting now to work with Unified panels, and I want to see what is possible to do with scripting. I see some good examples here and on YouTube, but I don't found any example how to write a script for OnPropertyChanged event.

I even not understand the mechanism behind this (I can use the syntax "CurrentParameterSetID.Value" or the read method like "CurrentParameterSetID.Read()")

For concrete example:

I created a Parameter set control object on my screen. I would like to set a Tag in case that the value of my property "CurrentParameterSetID" is changed (in other words the operator is selecting a recipe).

I modified my script to be without "return value" but still not work. 

Stefan Arcularius

Hi GabyT,

An OnPropertyChanged event does not allow a return value. You should also be aware of using a return statement, which will abort the function upon execution.

It may be easier for us volunteers to know your requirements, so please tell us more about your goals.

Kind regards
Stefan

Hello,

With TraceViewer I was able to find the issue. The problem was with the Uncaught reference, I mean I try to write "TRUE" in my Boolean Tag. After I changed t integer everything was fine,

Also with boolean would be ok if I write "1" instead of "TRUE"

Here is my corected script:

Thank you for support.