Safe Operating Stop (Sos) - Siemens SINAMICS S210 Operating Instructions Manual

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4.2.5

Safe Operating Stop (SOS)

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After SOS has been selected it becomes active after the parameterizable delay time has
expired. The drive must be braked to standstill within this delay time, e.g. by the controller.
Applications
SOS is suitable for the following applications:
● Machine parts must be safely monitored that they actually are at a standstill.
● A holding torque is required.
SINAMICS S210 servo drive system
Operating Instructions, 01/2019, A5E41702836B AC
● SS2 is selected via the control bit of the selected PROFIsafe telegram.
● The SBR delay time (p9582) is initiated with selection of SS2. Monitoring of the braking ramp is
initiated once the delay time has elapsed.
● You set the braking ramp with the reference speed (p9581) and the SBR monitoring time
(p9583).
● The drive deactivates monitoring of the braking ramp if speed falls below the SBR speed limit
(p9568).
● Standstill is safely monitored (SOS becomes active) once the SS2 delay time (p9552) has
elapsed.
● The drive is in control mode and monitors the standstill tolerance (p9530).
● If the standstill tolerance is violated, then the drive responds with SS1 and then transitions into
STO.
● The "SS2_active" status is signaled in the status bit of the PROFIsafe telegram.
This value can be applied in the higher-level controller.
● If SOS is active, the "SOS_active" status is also signaled in the corresponding status bit of the
PROFIsafe telegram.
∆t
Safety functions integrated in the drive
When SOS is selected, the drive safely mon‐
itors the drive position for standstill. The drive
is in the closed-loop control mode, and can
therefore withstand external forces.
t
4.2 Extended Functions
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