Lets say your LED is called OEM # 2000 (your status LED), in screen 4 the one that you can see around the button, what you need is a two state process.
in your button put this code for instance:
If Not(GetUserLED(2001)) then 'this is the control LED
SetUserLED(2001,1) 'Note your Brain will turn this back off
end if
Next in your brain be watching LED2001 and send it to your PLC, have your Plc
data come in and have it same address comming in,
the first rung turns on LED 2000
the second rung turns OFF led 2001.
scott