Accessing a UDT Data Type Parameter in a tag change event

[jasoncoope]

I have a UDT with a number of data type parameters that I’d really like to read the value of from my tag change event script (on one of the UDT tags). Is it possible to access the data type parameter with system.tag.read() or some other python method? I know I can create a memory tag and bind that to the data type parameter value, but I’d rather keep the number of tags small if I can.

[Paullys50]

I have not found a way to do this. I default to creating a parameter folder in the udt which has expression tags bound to the parameters. Hoping this changes in 8.

[jasoncoope]

Found another posting in this forum that has a solution to this.

Reading UDT Parameter Value?

You will need to read and parse the UDT instance’s extended properties. # The name of the parameter to be read paramName = "MyUDTParam" path = "%s.ExtendedProperties" % myUDTInstanceFullPath props = system.tag.read(path) if props.value is not None: for prop in props.value: if prop.getProperty().name.lower() == paramName.lower(): print prop.value break