Use an LED indicator for alarms. Right click and select the properties page. Set the ON color to RED and the OFF color to very dark red. When the alarm condition occurs, set the LED true. Resize the LED to make it BIG. Some people like to see a blinking LED when an alarm occurs. Use the Blinking property node to do this.
Interlocks are best if colored green and yellow. Again use an LED. Color depends upon the terminology. What is considered a safe conditon? Does interlock on mean it is in place to prevent accidents? Or does interlock on mean that someone activated the interlock and it has done its thing to prevent an accident? Does interlock off mean that someone has disabled the interlock, and an accident can happen? Whichever way, the safe condition should show a green color, and the unsafe condition should show a yellow color.
