Operator: __ISVALIDREF The operator is an extension of the IEC 61131-3 standard. The operator is used for checking whether a reference refers to a valid value. For a description of use and an example,

Compiler Error C0180 Message : Ambiguous namespace '<library 1>' defined by library '<library 2>' Possible error cause : The namespace of the library <library 1> is not unique. It is already used for

Compiler Error C0182 Message : Return type is only possible for POUs of Type FUNCTION and METHOD Possible error cause : An attempt is made to define a return value in a program. Error correction : Def

Compiler Error C0183 Message : Global scope operation '.' is not valid on expression '<expression>' Possible error cause : The '.' operator is used to access a global variable. However, at this locati

Compiler Error C0185 Message : It is not possible to perform component access '.', index access '[]' or call '()' on result of function call. Assign result to help variable first. Possible error cause

Compiler Error C0186 Message : It is not possible to compare interface that is return value of call. Assign to variable first. Possible error cause : A comparison operation is applied to an interface

Compiler Error C0188 Message : Device not installed to the system. No code generation possible. Possible error cause : The desired device is not installed. Error correction : Install the missing devic

Compiler Error C0189 Message : ';' expected instead of '<token>' Possible error cause : Syntax error Error correction : Make sure that the syntax is correct. Example 395 . Example of the error: PROGRA

Compiler Error C0190 Message : ';' expected instead of end of POU Possible error cause : Syntax error in the POU Error correction : Make sure that the syntax is correct. Example 396 . Example of the e

Compiler Error C0191 Message : The operator 'INDEXOF' is no longer supported. Use ADR instead. ADR on a POU-Name returns a Pointer to a Pointer to the function code. Possible error cause : The outdate