using 30 second timer and instant trigger

The delay overrides the instant trigger, if the delay is started first.  Where there is a problem is if they are triggered "at the same time" and the instant is recognized first.

I have a motion sensor in the room with the keypad.  When the system is armed and I enter, I trigger the delay by opening the entry door which is not in view of the motion sensor.  When I walk into the room with the keypad, the motion sensor does not set the alarm off because as seven says, the delay overrides the motion. The motion sensor does work, I test it every other month as-recommended by Captain11. :-)

Or, simply put, whatever is triggered first takes precedence.