JUMO LOGOSCREEN 601 Manual page 42

8 Functions
NOT
Inversion (form complement)
Examples:
IN := 1;
OUT := NOT IN; (* OUT = 0 *)
IN := 43690;
OUT := NOT IN; (* 0101 0101 0101 0101; OUT = 21845 *)
42
(* 1010 1010 1010 1010 *)