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Output variables - VAR_OUTPUTdl-permalink__symbolPermalink

Output variables are used at the outputs of function blocks.

‎VAR_OUTPUT‎ variables are declared between the keywords ‎VAR_OUTPUT‎ and ‎END_VAR‎ in the declaration part of programming objects. CODESYS returns the values of this variable to the calling POU. There you can retrieve the values and continue using them.

You can extend output variables with an attribute keyword.

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

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