Error in Expression Binding

Ignition
1

Hi, I am making a template for a pump on a VFD. I have a template parameter VFDTag which I use in expression bindings. Most work fine, however I need to change the color of the Fill Paint for several shapes based on the status of a “Running” tag. I am using the following expression:

if((tag(’[default]Pumps/VFD’ + {VFD.VFDTag} + ‘/Running’)),color(255,250,250),color(155,140,140))

The expression changes the Fill Paint color but I also get (2) repeated error messages:

java.lang.ClassCastException: Cannot coerce value ‘true’ into type: interface java.awt.Paint
at com.inductiveautomation.ignition.common.TypeUtilities.coerce(TypeUtilities.java:1427)
at com.inductiveautomation.factorypmi.application.binding.AbstractPropertyAdapter.setQValue(AbstractPropertyAdapter.java:222)
at com.inductiveautomation.factorypmi.application.binding.AbstractPropertyAdapter.updateValue(AbstractPropertyAdapter.java:264)
at com.inductiveautomation.factorypmi.application.binding.ExpressionPropertyAdapter.runExpression(ExpressionPropertyAdapter.java:89)
at com.inductiveautomation.factorypmi.application.binding.ExpressionPropertyAdapter$1.run(ExpressionPropertyAdapter.java:59)
at com.inductiveautomation.ignition.client.util.EDTUtil$ProcessQueue.run(EDTUtil.java:127)
at java.desktop/java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.run(Unknown Source)

Ignition v8.0.12 (b2020042115)
Java: Azul Systems, Inc. 11.0.6

Is there any way to eliminate the error messages?

Thanks,

Dennis Hoskins

2

Considering you’re not using tags for your colours, you can just use an indirect binding and select your colours instead from the colour pickers

3

Also if possible using the hex string instead of the color() expression may solve this too

4

I’ve only ever had issues using color(...) if i’m trying to use it in combination with strings (e.g. HEX, or even just the RGB values as a string). The expression language doesn’t handle type-casting, I think it grabs the data type from the first return value (in an if, that would be the true value) and expects that data type for all return values

2 Likes
5

Thank you nminchin, that worked although I think my original approach should have also worked.
Dennis

1 Like
6

Yes, it should have worked, not sure why you were getting errors :thinking: