Note
Size of the tolerance window
The size of the tolerance window should be slightly above the standard standstill monitoring
limit, otherwise the standard monitoring functions will no longer be effective.
Parameter r9731 indicates the safe position accuracy (load side) that can be achieved as a
maximum, based on the acquisition of the actual value for the safe motion monitoring functions.
STOP B is the stop response after the standstill tolerance window has been violated.
The SOS function comes into effect in the following cases:
● After SOS is selected and the delay time in p9551 has elapsed
The drive must be braked to standstill within this delay time (e.g. by the controller).
● As a consequence of SS2, SS2E or SS2ESR
● As a consequence of STOP C (corresponds to selection of SS2)
● As a consequence of STOP D (corresponds to selection of SOS)
● As a consequence of STOP E (corresponds to selecting SOS with additional activation of
the standard "Extended stop and retract (ESR)" function)
Responses
● Standstill tolerance violated in p9530
– STOP B with subsequent STOP A
– Safety message C01707
● System error
– STOP F
– Safety message C01711
Function diagrams (see SINAMICS S120/S150 List Manual)
● 2819 SI Extended Functions - SS1, SS2, SOS, internal STOP B, C, D, F
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● p9501 SI Motion enable safety functions (Control Unit)
● p9530 SI Motion standstill tolerance (Control Unit)
● p9551 SI Motion SLS(SG) switchover/SOS(SBH) delay time (CU)
● r9722.0...31 CO/BO: SI Motion drive-integrated status signals
● r9731 SI Motion safe positioning accuracy
Safety functions integrated in the drive
4.7 SOS
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB 127
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