Probability Of Failure For Safety Functions; Response Times - Siemens Sinamics S110 Function Manual

8.3.4

Probability of failure for safety functions

Probability of failure
The probabilities of safety function failure must be specified in the form of a PHF value
(Probability of Failure per Hour) to IEC 61508, IEC 62061 and ISO 13849-1. The PFH value
of a safety function depends on the safety concept of the drive unit and its hardware
configuration, as well as on the PFH values of other components used for this safety
function.
Corresponding PFH values are provided for the SINAMICS S110 drive unit, depending on
the hardware configuration (control type, ...). The various integrated safety functions are not
differentiated.
The PHF values can be requested from your local sales office.
8.3.5

Response times

Controlling the Basic Functions
Control of the Basic Functions via terminals
The table below shows the control response times via terminals.
Table 8- 3 Response times when controlling the Basic Functions via terminals
Function
STO
SBC
SS1 (time controlled)
Selection up until STO is initiated
SS1 (time controlled)
Selection up until SBC is initiated
For t_E (debounce time of the digital input F-DI 0):
p9651 = 0
p9651 ≠ 0
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
Typical
1)
2 x r9780 + t_E
4 x r9780 + t_E
2 x r9780 + p9652 + t_E
4 x r9780 + p9652 + t_E
t_E = p0799 (default = 4 ms)
t_E = p9651 + 1 ms
Safety Integrated Functions
8.3 System features
Worst case
1)
7 x r9780 + t_E
11 x r9780 + t_E
7 x r9780 + p9652 + t_E
11 x r9780 + p9652 + t_E
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