Operator: LT The IEC operator is used for the "less than" function. Permitted data types of the operands: any basic data type If the first operand is less than the second operand, then the operator yi

Operator: LE The IEC operator is used for the "less than or equal to" function. Permitted data types of the operands: any basic data type If the first operand is less than or equal to the second opera

Operator: GE The IEC operator is used for the "greater than or equal to" function. Permitted data types of the operands: any basic data type If the first operand is greater than or equal to the second

Operator: EQ The IEC operator compares two operands for equality. All elementary data types are permitted as data types for the operands. If the operands are equal, then the operator yields the result

Operator: NE The IEC operator compares two operands for inequality. All elementary data types are permitted as data types for the operands. If the operands are unequal, then the operator yields the re

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 C0178 Message : No external access to 'VAR_IN_OUT' parameter '<parameter name>' of '<object name>' Possible error cause : An attempt is made to remotely access a 'VAR_IN_OUT' parameter.

Compiler Error C0179 Message : '<identifier>' is no output of 'Function block' Possible error cause : The initialization of a function block instance must not contain VAR_IN_OUT variables. Error corre

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