Assigning identifiers

Identifiers are the names of variables and programming objects such as programs, function blocks, methods etc. and names of other PLC project objects. There are certain rules that you must follow when assigning identifiers. In addition, there are recommendations that serve to make the identifiers consistent and meaningful.

Variable identifiers are assigned at the variable declaration stage. You can change these identifiers in the declaration part of the programming object. The identifiers for programming and other objects are assigned in the dialog when the respective object is added. You can change the identifier of an existing PLC project object in the Properties window of the object. Identifiers of objects, which can only exist once in each PLC project, cannot be modified. These include the References and RecipeManager identifiers.

See also:

Reference Programming > Identifiers
TwinCAT 3 Programming conventions > Identifier/name