Element scope definitions

These rules define the scope of

FactoryTalk Design Studio

elements.

Controller application tags and parameters

Controller application tags and parameters are accessible to the entire controller application in which they are defined. They can be used by all routines defined within one controller application. In other words, the data in controller tags or parameters are available to every task, program, and routine within the controller application.

Controller application tags and parameters are not directly accessible to programs and routines within Smart Objects. You must use parameter connections to pass the tag or parameter values between them.

Programs

Program defined in a controller application: tags and parameters are accessible exclusively by the routines within an individual program within the same controller application. This means that program tags and parameters can have the same name in more than one program, allowing programs to be copied and reused more easily.

Program defined in a Smart Object: tags and parameters are accessible by the routines defined in the program. Smart Object instances can access the program tags and parameters to provide Smart Object instance specific data values.

Routines

Routine defined in a controller application: tags/parameters are only accessible to the routine. The JSR instruction is used to pass data in and out of the routine parameters.

Routine defined in a Smart Object: tags/parameters are only accessible to the routine. Smart Object instances can access the routine tags/parameters to provide Smart Object instance specific data values.