Efficient Networks Siemens Sinamics S120 - Manual (Page 301)

Safety Integrated basic functions
9.1 General information
Drive Functions
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
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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 clock cycle.
The safety monitoring clock cycle lasts a minimum of 4 ms. Increasing the basic DRIVE-
CLiQ sampling time (p0110) also increases the safety monitoring clock cycle.
Crosswise data comparison
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.
Parameter overview (see SINAMICS S List Manual)
● r9780 SI monitoring clock cycle (Control Unit)
● r9880 SI monitoring clock cycle (Motor Module)
Comparison of function names
Table 9-1 Comparison of safety function names old <-> new
old new according to IEC 61800-5-2
Abbreviation Name New abbreviation New name
SH Safe standstill STO Safe Torque Off
SGA Safety-related output F-DO Failsafe Digital Output
SGE Safety-related input F-DI Failsafe Digital Input
9.1.2 Supported functions
Supported functions:
The functions mentioned here are in compliance with IEC 61800-5-2.
The following Safety Integrated (SI) functions are available:
● Safety Integrated basic functions
These functions are part of the standard scope of the drive.