Operator: __QUERYINTERFACE The operator is an extension of the IEC 61131-3 standard. At runtime, the operator executes a type conversion of an interface reference into another type. The operator retur

Operator: __QUERYPOINTER The operator is an extension of the IEC 61131-3 standard. At runtime, the operator makes it possible to convert the type of an interface reference of a function block to a poi

Operator: __TRY, __CATCH, __FINALLY, __ENDTRY These operators are extended from the IEC 61131-3 standard and they are used for specific exception handling in IEC code. Syntax __TRY <statements_try> __

Operator: __VARINFO The operator is an extension of the IEC 61131-3 standard. The operator yields information about a variable. You can save the information as data structure in a variable of data typ

Operator: __CURRENTTASK The operator is an extension of the IEC 61131-3 standard. At runtime, the operator provides information about the IEC task that is currently running. Tip The operator is suppor

Operator: __COMPARE_AND_SWAP The multicore operator is an extension of the IEC 61131-3 standard. The operator can be used for implementing a semaphore, for example to guarantee exclusive access to a v

Operator: __XADD The multicore operator is an extension of the IEC 61131-3 standard. The operator can be used for implementing an atomic counter. If an integer variable is incremented by means of ordi

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

Operator: __POUNAME The operator is an extension of the IEC 61131-1 standard. At runtime, the operator yields the name of the POU that contains the operator __POUNAME . The result is of type STRING .

String Constants A string constant is a string enclosed in single straight quotation marks. The characters are coded according to the character set specified in ISO/IEC 8859-1. Therefore, a string con