Reaction Times And Safety Characteristics For Fail-Safe Operation - Siemens SIMATIC PRO Extension Units KP Series Operating Instructions Manual

6.4.3

Reaction times and safety characteristics for fail-safe operation

The table below shows the safety characteristics and reaction times from the emergency
stop button of the Extension Unit to the X1 PROFINET interface of the communication
module.
In accordance with IEC 61508
Safety Integrity Level
Mode of operation
Meantime to Restoration (MTTR)
Probability of a dangerous failure per
hour (PFH)
Probability of a dangerous failure on
demand (PFD)
Diagnostic test interval
Proof Test Interval
Lifetime
In accordance with IEC 13849-1
Meantime to Failure (MTTFd)
Meantime to Restoration (MTTR)
Diagnostic Coverage (DCavg)
Performance level
Category
All values are based on the SN 29500:2005 and an ambient temperature of 60 °C.
Note
Times
The specified times do not include the times of the applicable safety relay or the safety
program (PROFIsafe), including the PNIO cycle time and F-monitoring time.
Use the following table for calculation of the total reaction time: S7Safety_RTTplus.xlsm
(https://support.industry.siemens.com/cs/#document/93839056?lc=en-US)
Extension Units KPxx
Operating Instructions, 05/2019, A5E43600360-AC
Configured operating mode
1oo1
SIL2
high and low demand mode
100 h
< 6 × 10 1/h
-10
< 8 × 10
-5
15 ms
1 x per year
20y
high
100 h
high
d
3
Technical specifications
6.4 Technical specifications
1oo2
SIL3
high and low demand mode
100 h
< 3 × 10 1/h
-10
< 8 × 10
-5
15 ms
1 x per month
20y
high
100 h
high
e
4
89