The hardware's internal structure provides a significant safety benefit. All connections from I/O cards to the central master card are designed as point-to-point connections. Together with the hot-plug capacity of all components it is therefore guaranteed that a faulty I/O card cannot deactivate your entire mounting frame.
It is also possible to provide the master card in a redundant design which is ideally supported by the double star architecture of the backplane. As the power supply units can also be provided in a redundant design, full redundancy of all vital components can be achieved.