Variable: VAR_OUTPUT

Output variables are used at the outputs of function blocks. You declare VAR_OUTPUT variables between the VAR_OUTPUT and END_VAR keywords in the declaration part of POUs. The values of this variable are returned to the calling POU. There you can retrieve the values and continue using them.

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

Example 82. Example

VAR_OUPUT
        iOut1 : INT; (*1st output variable *)
END_VAR

Output variables in functions and methods

According to the IEC 61131-3 standard, functions and methods have additional outputs. You have to assign these additional outputs when calling the function, as shown below.

Example 83. Example

fun(iIn1 := 1, iIn2 := 2, iOut1 => iLoc1, iOut2 => iLoc2);