Parenthesis ()

The brackets () are used in expressions to force a specific order of evaluation.

Example:

INCLUDE rtcu.inc
 
VAR
  a : INT;
  b : INT;
END_VAR;
 
PROGRAM test;
 
BEGIN
  ...
  a := 2 + 3 * 4; // Result will be 14, as * (multiply) has higher priority that +
  a := (2 + 3) * 4; // Result will be 20 as the 2+3 is given highest priority because of the () brackets
  ...
END;
 
END_PROGRAM;