Variable: VAR

Input variables are used at the inputs of function blocks. You declare ‎VAR_INPUT‎ variables between the ‎VAR_INPUT‎ and ‎END_VAR‎ keywords in the declaration part of POUs.

The variable can be extended with an attribute keyword (‎CONSTANT‎, ‎RETAIN‎, or ‎PERSISTENT‎).

Example

VAR_INPUT
        iIn1 : INT; (* 1st input variable *)
END_VAR