The - operator subtracts two integer or floating-point numbers and returns the result. It is also used to change the sign of a number (see below).
Example:
INCLUDE rtcu.inc VAR a :INT; b :INT; END_VAR; PROGRAM test; BEGIN ... a := b - 10;// Subtract 10 from b and assign value to a ... b := -b;// Change sign of b ... END; END_PROGRAM;