Operator: __POSITION The operator is an extension of the IEC 61131-1 standard. At runtime, the operator yields the position of a variable in the declaration part or in the implementation part of a POU

Variable: VAR_INST The VAR_INST instance variables are allowed only in methods. This kind of variable can be accessed only within the method. You can monitor the variable values of instance variables

Variable: VAR_CONFIG Configuration variables assign the full address to variables which are declared in function blocks with incomplete address information and that should be mapped to device I/Os. Th

Variable: CONSTANT Constant variables are declared in global variable lists or in the declaration part of programming objects. In implementations, constant variables can be accessed as read-only via t

Variable: VAR_GENERIC CONSTANT Generic Constant Variable A generic constant is a variable in the VAR_GENERIC CONSTANT declaration area of a function block which is not assigned an initialization value

Variable: PERSISTENT Persistent variables are declared in the declaration section VAR_GLOBAL RETAIN PERSISTENT in the persistent global variable list. For variables that are marked with the PERSISTENT

Variable: RETAIN Retain variables are declared by the keyword RETAIN is added in programming objects in the scope VAR , VAR_INPUT , VAR_OUTPUT , VAR_IN_OUT , VAR_STAT , or VAR_GLOBAL . Syntax for the

Pointer: SUPER The SUPER pointer is a special variable which is used for object-oriented programming. SUPER is the pointer of a function block to the base function block instance from which the functi

Pointer: THIS The THIS pointer is a special variable which is used for object-oriented programming. THIS is the pointer of a function block to its own function block instance. A THIS pointer is automa

Data Type: Implicit Enumeration The implicit enumeration allows for an easy way to declare a new enumeration variable which is valid only within the local POU. A variable of this type can take a limit