Siemens SINAMICS S120 System Manual page 199

– Safe Torque Off (STO)
– Safe Stop 1 (SS1, time and acceleration controlled)
– Safe Operating Stop (SOS)
– Safe Stop 2 (SS2)
– Safely Limited Speed (SLS)
– Safe Speed Monitor (SSM)
– Safe Direction (SDI)
– Safely Limited Position (SLP)
– Transferring safe position values (SP)
Note
Only "linear" axis type permitted
For SINAMICS HLA, only the "linear" axis type is permitted.
Hydraulic Drive
System Manual, 04/2015, 6SL3097-4BA00-0BP1
Safe Torque Off is a safety function that prevents the drive from restarting
unexpectedly according to EN- 60204-1.
Safe Stop 1 is based on the "Safe Torque Off" function. This means that a Category 1
stop in accordance with EN 60204-1 can be implemented.
Safe Operating Stop is used to protect against unintentional movement. The drive is in
closed-loop control mode and is not disconnected from the power supply.
Safe Stop 2 is used to safely brake the valve with a subsequent transition into the
"Safe Operating Stop" state (SOS). This means that a Category 2 stop in accordance
with EN 60204-1 can be implemented.
Safely Limited Speed ensures that the drive does not exceed a preset speed limit.
Safe Speed Monitor is used for safely identifying when a speed limit is undershot in
both directions of motion, e.g. to identify zero speed. A fail-safe output signal is
available for further processing.
Safe Direction is used to safely monitor the direction of motion.
Safely Limited Position ensures that a freely definable traversing range is not left.
The "Transfer safe position values (SP)" function enables you to transfer a safe
position to a higher-level control via PROFIsafe.
Drive functions
5.14 Safety Integrated
199