Siemens SINAMICS G120 Function Manual page 51

Components in separate control cabinets
If the components are located in separate control cabinets, the wiring between the safety
relay and fail-safe digital inputs on the inverter must be installed such that it is protected
against cross and short-circuits.
Transfer the two signals for activating a safety function via wires in separate lines. In the
example, the signals for terminal 5 and 7 are transferred via the first line. The signals for
terminal 6 and 8 are then transferred via the second line.
Figure 3-10
Safety Integrated Function Manual, SINAMICS G120
Function Manual, 07/2010, FW 4.3.2, A5E03052391B AA
Interconnecting the inverter and safety relay in separate control cabinets
Activation
3.2 Activation via F-DI
51