Siemens SINAMICS S120 Function Manual page 61

Response time with the "Safe Brake Control" function
For the response times when the function is selected/deselected via input terminals, see the
table in "Response times".
Examples
Safety Integrated Basic Functions via terminals:
Safety monitoring clock cycle CU (r9780) = 4 ms and
inputs/outputs sampling time (r0799) = 4 ms
t
R_typ
t
R_max
NOTICE
When the brake is controlled via a relay with "Safe Brake Control":
If "Safe Brake Control" is used, it is not permissible to control the brake via a relay. This can
result in incorrect feedback regarding a brake fault.
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● p0799 CU inputs/outputs sampling time
● r9780 SI Monitoring clock cycle (Control Unit)
● r9880 SI Monitoring clock cycle (Motor Module)
Safety Integrated
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
= 4 x r9780 (4 ms) + r0799 (4 ms) = 20 ms
= 8 x r9780 (4 ms) + r0799 (4 ms) = 36 ms
Safety Integrated Basic Functions
4.3 Safe Brake Control (SBC)
61