Siemens SINAMICS S120 Function Manual page 581

Switch-off signal paths
Two independent switch-off signal paths are available. All switch-off signal paths are low-
active, thereby ensuring that the system is always switched to a safe state if a component
fails or in the event of an open circuit.
If a fault is discovered in the switch-off signal paths, the "Safe Torque Off" function is
activated and a system restart inhibited.
Monitoring cycle
The safety-relevant drive functions are executed cyclically in the monitoring cycle.
The safety monitoring cycle lasts a minimum of 4 ms. Increasing the current controller cycle
(p0115) also increases the safety monitoring cycle.
Data cross-check
A cyclic cross-check of the safety-related data in the two monitoring channels is carried out.
If any data is inconsistent, a stop response is triggered with any Safety function.
Overview of important parameters (see SINAMICS S120/S150 List Manual)
• r9780
• r9880
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
SI monitoring cycle (Control Unit)
SI monitoring cycle (Motor Module)
Safety Integrated basic functions
10.2 General information
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