Attention

IronPLC supports IEC 61131-3 Structured Text excluding I/O mapping.

CASE

The CASE statement selects one of several statement groups based on the value of an integer expression.

IEC 61131-3	Section 3.3.2.3
Support	Supported

Syntax

CASE expression OF
    case_value { ',' case_value } ':' statement_list
    { case_value { ',' case_value } ':' statement_list }
[ ELSE
    statement_list ]
END_CASE ;

Each case_value is an integer literal or a subrange (low .. high). Multiple values can be listed separated by commas.

Description

The CASE statement evaluates the expression and compares it against each case value in order. When a match is found, the corresponding statement list executes and control passes to the statement after END_CASE. If no match is found and an ELSE clause is present, its statement list executes.

Unlike C-style switch statements, there is no fall-through between cases.

Example

See Also

• IF — conditional branching