Need help with program

You can do an infinite loop like

Loop
If (in 8) then
..
Endif
If (in 9) then
...
Endif
Endloop

that works if you don't care for example if both inputs are active at the same time.

if this is supposed to work only when one sensor is TRUE and other is FALSE, your expressions need to be modified. and if you have more than two sensors doing this evaluation, this quickly becomes hard to read.

in those cases it would be better to use some more compact way of decision making.

Suppose you have several sensors and only want to proceed if only ONE of them is active.

and suppose the inputs are 8,9,10 and 11.

then it would be easier to use signal that groups those inputs into a single value and use SWITCH statement. and if main program is looping but there is nothing to do, display gets jumpy.

to eliminate that we can add tiny delay somewhere in the loop.

SIGNAL SelectionValue $IN[8] to $IN[11]
;
;

LOOP

SWITCH SelectionValue

Case 'B0000'
   ; nothing to do...
   WAIT SEC 0.1 ; not essential, just easier on the eyes

Case 'B0001'
   ; input 8 is active, do thing "A"

Case 'B0010'
   ; input 9 is active, do thing "B"

Case 'B0100'
   ; input 10 is active, do thing "C"

Case 'B1000'
   ; input 11 is active, do thing "D"

Default
  MsgQuit("Aborting program because more than one sensor is active")
  RETURN 
ENDSWITCH

ENDLOOP

Reply from the panic is more suitable.