IF Condition THEN
    statement(s)
{ ELSE
    statement(s) }
  ENDIF

Function
Evaluate Condition and, if it is true, run the code block that follows THEN, otherwise jump to the (optional) code block that follows ELSE. If no ELSE block is provided, the program will continue at the line that follows ENDIF.

• Condition  is a simple statement, such as "x = 7" that can be evaluated as True or False.
• Statement  is any valid SX/B program statement.

Explanation
IF...THEN...ELSE is a primary decision maker that allows one block of code or [optionally] another to run based on the result (True or False) of a condition. The available comparison operators are:

Comparisons are always written in the form: Variable Op Value.

• Variable  is a bit or byte variable.
• Op  is the comparison operator.
• Value  is a variable or constant for comparison.

This simple example shows how IF...THEN...ELSE is used with a subroutine that can accept one or two parameters.

' Use: DELAY milliseconds {, multiplier}
' -- pause for milliseconds x (optional) multiplier

DELAY:
  temp1 = __PARAM1
  IF __PARAMCNT = 1 THEN                        ' if only base time
    temp2 = 1                                   ' set multiplier to 1
  ELSE
    temp2 = __PARAM2                            ' else use multiplier
  ENDIF
  IF temp1 > 0 THEN
    IF temp2 > 0
      PAUSE temp1 * temp2
    ENDIF
  ENDIF
  RETURN

Related instruction: IF...THEN

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