Siemens SINAMICS S150 - Safe Operating Stop (SOS)

Safety Integrated Extended Functions
6.6 Safe Operating Stop (SOS)
Safety Integrated
90 Function Manual, 05/2010, A5E03264275A
6.6 Safe Operating Stop (SOS)
General description
Note
The "Safe Operating Stop" function is only available for operation with an encoder.
This function serves for fail-safe monitoring of the standstill position of a drive.
Personnel can enter the protected machine areas without having to shut down the machine
as long as SOS is active.
Drive standstill is monitored by means of an SOS tolerance window (p9330 and p9530). The
function SOS comes into effect in the following cases:
● After SOS has been selected and after the delay time set in p9351/p9551 has elapsed.
The drive must be braked to standstill within this delay time (e.g. by the controller).
● As a consequence of SS2.
● As a consequence of STOP C.
● As a consequence of STOP D.
When this function is activated, the current actual position is saved as a comparative
position, until SOS is deselected again. There is no delay time after SOS has been
deselected; the drive can be operated immediately and also again accelerates immediately
to the setpoint set at that time.
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Figure 6-4 Standstill tolerance