Diagnostics address for hardware objects
The LADDR (logical base address) is used as diagnostics address for hardware objects like interfaces, ports, modules and submodules. This address is used in the context of alarms/diagnostics and reading/writing of records. PROFINET IO specifies addressing of a hardware object (e. g. reading a record from a submodule) via its geographic address (interface number, station number, slot number and subslot number). Since the geographic address is impractical to handle, the logical address LADDR is also available.