Siemens SINAMICS S150 - Page 66

Safety Integrated Basic Functions
5.1 Safe Torque Off (STO)
Safety Integrated
66 Function Manual, 05/2010, A5E03264275A
CAUTION
If two power transistors simultaneously fail in the power unit (one in the upper and one in
the lower bridge), then this can cause brief momentary movement.
The maximum movement can be:
Synchronous rotary motors: Max. movement = 180 ° / No. of pole pairs
Synchronous linear motors: Max. movement = pole width
● The status of the "Safe Torque Off" function is displayed using parameters.
Enabling the "Safe Torque Off" function
The "Safe Torque Off" function is enabled via the following parameters:
● STO via terminals on the Control Unit and the power unit
p9601.0 = 1, p9801.0 = 1
● STO via PROFIsafe:
– p9601.0 = 0, p9801.0 = 0
– Basic Functions: p9601.2 = 0, p9801.2 = 0
Extended Functions: p9601.2 = 1, p9801.2 = 1
– p9601.3 = 1, p9801.3 = 1
● STO via PROFIsafe and terminals:
– p9601.0 = 1, p9801.0 = 1
– Basic Functions: p9601.2 = 0, p9801.2 = 0
Extended Functions: p9601.2 = 1, p9801.2 = 1
– p9601.3 = 1, p9801.3 = 1
● STO via TM54F (only with "Extended Functions" option):
– p9601.2 = 1, p9801.2 = 1
– p9601.3 = 0, p9801.3 = 0