Application Relationships (AR)
On PROFINET, a connection between an IO Controller/Supervisor and an I/O device (in this case the Anybus) is called Application Relationship (AR). The Anybus module supports multiple simultaneous Application Relationships, allowing multiple IO Supervisors to access its data and functions.
The host implementation can either ignore this functionality altogether, in which case the Anybus module will handle it automatically, or integrate the establishment and handling of Application Relationships into the host firmware.
Application Relationships are managed through the following functions:
AR_Check_Ind (for command details see PROFINET IO Object (F6h))
Expected_Ident_Ind (for command details see PROFINET IO Object (F6h))
AR_Abort_Ind (for command details see PROFINET IO Object (F6h))
AR_Abort (for command details see Network PROFINET IO Object (0Eh))