Siemens Sinamics G120 Function Manual page 73

Components in separate control cabinets
Figure 4-17
For configurations and designs in separate control cabinets, route cables between the modular
safety system and the inverter so that they are protected against cross circuits and short
circuits.
If you wish to use the fail-safe digital outputs of the 3RK3 central module for a two-channel
signal transfer, then you must adapt the discrepancy monitoring of the inverter to the different
switching times of electronic output and relay contact.
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 01/2017, FW V4.7 SP6, A5E34261271B AD
Connecting the modular safety system in separate electrical cabinets using SINAMICS
G120 with CU240E‑2 as example
4.4 Controlling via a fail-safe digital input
Installing
73