Siemens SINAMICS S110 - Safe Operating Stop (SOS)

Safety Integrated Functions
8.5 Safety Integrated Extended Functions
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
373
8.5.5 Safe Operating Stop (SOS)
General description
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 expired.
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 (corresponds to selection SS2)
● As a consequence of STOP D (corresponds to selection SOS)
● As a consequence of STOP E
When this function is activated, the current actual position is saved as a comparative
position, until SOS is deselected again. Any delay time is cleared after SOS is deselected
and the drive can be immediately moved.
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Figure 8-6 Standstill tolerance
Note
The "Safe Operating Stop" (SOS) safety function can only be used with an encoder.