Siemens SINAMICS S120 Function Manual page 684

Safety Integrated Basic Functions
10.4 Safe Torque Off (STO)
Restart after the "Safe Torque Off" function has been selected
1. Deselect the function.
2. Set drive enables.
3. Cancel the "switching on inhibited" and switch the drive back on.
– 1/0 edge at input signal "ON/OFF1" (cancel "switching on inhibited")
– 0/1 edge at input signal "ON/OFF1" (switch on drive)
Status for "Safe Torque Off"
The status of the "Safe Torque Off" (STO) function is displayed using the parameters r9772,
r9872, r9773 and r9774.
As an alternative, the status of the functions can be displayed using the configurable
messages N01620 and N30620 (configured using p2118 and p2119).
Response time for the "Safe Torque Off" function
For the response times when the function is selected/deselected via input terminals, see the
table in Section "Response times (Page 693)".
Internal armature short-circuit with the "Safe Torque Off" function
The function "internal armature short-circuit" can be configured together with the "STO"
function.
The "STO" safety function has the higher priority when simultaneously selected. If the "STO"
function is initiated, then an activated "internal armature short-circuit" is disabled.
Overview of important parameters (see SINAMICS S120/S150 List Manual)
• p0799[0...2]
• p9601
• r9772.0...23
• r9773.0...31
• r9774.0...31
• r9780
684
CU inputs/outputs, sampling time
SI enable functions integrated in the drive (Control Unit)
CO/BO: SI Status (Control Unit)
CO/BO: SI status (Control Unit + Hydraulic Motor Module)
CO/BO: SI Status (group STO)
SI monitoring cycle (Control Unit)
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions