Operator: <= and >= (Less than or equal, Greater than or equal)

The <= operator compares two numbers or strings and returns TRUE if the left expression is smaller than or equal to the right expression.

The >= operator compares two numbers or strings and returns TRUE if the left expression is greater than or equal to the right expression.

The comparison is case-sensitive.

See example 2 below.

Example 1:

INCLUDE rtcu.inc
 
VAR
  a : INT;
  b : INT;
  t : BOOL;
END_VAR;
 
PROGRAM test;
 
BEGIN
  ...
  IF a >= b THEN
    // Will be executed if a is greater than or equal to b
     ...
  END_IF;
  ...
  IF a <= b THEN
    // Will be executed if a is smaller than or equal to b
     ...
  END_IF;
  ...
  t := b <= 10; // t is TRUE if b is smaller than or equal to 10
  ...
END;
 
END_PROGRAM;

Example 2:

INCLUDE rtcu.inc
 
VAR
  a : STRING := "Peter";
  b : STRING := "Jack";
  t : BOOL;
END_VAR;
 
PROGRAM test;
 
BEGIN
  ...
  IF a <= b THEN
    // Will not be executed as "Peter" is not less than or equal to "Jack"
     ...
  END_IF;
  ...
  t := a >= b; // t will be TRUE as "Peter" >= "Jack"
  ...
END;
 
END_PROGRAM;