I would like to control the buton’s visibility from a opc tag change
In the gateway tag change script i use the folowing code:
topDebutProd = system.tag.read(“QMP_rebox_2208/comPLC/topDebutProd”).value
But it seems the gateway can not reach the system.gui witch depend to the vision client…
Is there a way to do that?
Do not do this in a tag change event. In your project, make a custom property on your button and bind the tag to this property. Then in the buttons property change event do
If event.propertyName == 'yourCustomPropName':
Thank you for your quick answer. The button has a property visible but when i bind it to my tag, the buton is visible when my tag is true , i would like the opposite and didn’t find option to do that.
I have already a tag change event on this tag that is why i thought to control the vivibility by script
Anyway if it is not possible i will try your method. By
Just bind your visible property to the expression:
I have tried:
And many more but it always tell me: You must specify a tag or tag property…
Are you writing that into an expression binding or a tag/indirect tag binding? A tag binding only accepts a tag path, no transformations. The expression I said can only be used in an expression. If in Perspective, you could use a tag binding to read the tag value and then apply an expression transform to negate it, or you could just use an expression binding in either vision or perspective
OK finaly I have understood… thank you very much for the tip it works