Todd Dice (Customer) asked a question.
I am using an EA3-S3ML-R programmed in V4.51.0.0 connected serially to a P1-540 CPU programmed in V4.1.1.10.
I have an array tag "PLC to Panel" using an unsigned 16-bit integer. The HMI completely ignores any number sent to PLC to Panel(3) to change screen color. What am I doing wrong?

You may have noticed when entering the array tag into the PLC<->Panel setup that the Enable options for Beep Control and Change Background Color were deselected and greyed out. There is a note in CMM212 saying Address+1W and Address+2W are not available when an array tag is assigned to the Start Address.
You will need to use 3 consecutive non array tags.