FTView ME: Select Parameter File Based on Variable

[ck8177]

Is there a way to select a parameter file when loading a given screen based on the value of a variable? I see that under "Global Connections" the Parameter file field allows for an expression, so I attempted this:

If {[PLC]HMI.IO_Pointer} = 1 Then Pointer_01 Else If {[PLC]HMI.IO_Pointer} = 2 Then Pointer_02 Else Pointer_01

Where {[PLC]HMI.IO_Pointer} is a variable in the processor and Pointer_01 and Pointer_02 are parameter file names. I then used a set of momentary push buttons on the screen in question to increment/decrement the pointer variable in the PLC, and reload the screen using the remote display connections. FTView said all my syntax was valid, but no luck.

I also tried a set of GoTo pushbuttons with an HMI variable in place of a parameter file name, which FTView also said was valid but which also did not work...

I got the desired results with a set of GoTo buttons with direct assignments to the two parameter files, which directed to the screen with was already displayed. The only issue I have with this solution is that there will end up being upwards of ten or more parameter files, and I don't want to have to modify/layer multiple sets of GoTo buttons laid on top of each other for every future project.

I would like to have one set of two buttons on this particular page, and based on the value of a tag (HMI or PLC, either is fine) will call a certain parameter file when loading a screen. Global connections, macros, really special super-secret buttons, something I've already tried but with better syntax, I'm open to any suggestions. TIA

 

[plvlce]

I've never tried using an expression in the Global Connections as you are attempting, but your end goal is certainly achievable.

Simply point the global connection to a String tag in the PLC, then based on your current Pointer value load the name of the desired parameter file into the String.

EDIT: I've done this with Control/CompactLogix, can't speak for other PLCs.

 

[ck8177]

I've never tried using an expression in the Global Connections as you are attempting, but your end goal is certainly achievable.

Simply point the global connection to a String tag in the PLC, then based on your current Pointer value load the name of the desired parameter file into the String.

EDIT: I've done this with Control/CompactLogix, can't speak for other PLCs.

This worked perfectly, Thanks! I've attached the PLC code I used. I set up my HMI screen with placeholders and set up my parameter files, and put the PLC string tag in the Global Connections field for parameter file.

Thanks again!