JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual - Manual (Page 53)

6 Safety Manual
47 2013-04-01
6.10 Determining the achieved Performance Level (PL)
The following safety-related parameters are required to determine the Performance Level of components/devices:
As further parameters to be observed, operational aspects such as the demand rate and/or the test rate of the safety function
can also influence the resulting PL.
Excerpt from DIN EN ISO 13849-1:2008-12
Average failure probability of a safety
function on demand (overall system) SIL2:
Low demand: PFD
avg
< 10 -2
High demand: PFH < 10 -6
SIL3:
Low demand: PFD
avg
< 10 -3
High demand: PFH < 10 -7
Interval for repeat test No repeat test
Planned operating duration 10 years
Architecture according to DIN EN ISO
13849-1 Sensor system, one-channel: Cat. 2 Sensor system, two-channel: Cat. 3
MTTF
d
-DC
avg
according to DIN EN
ISO 13849-1 Table K.1
PL d: ≥ 62 years DC
avg
≥ 60 % PL e: ≥ 62 years DC
avg
≥ 90 %
Mode of operation and software
class according to DIN EN 14597 The JUMO safetyM STB/STW Ex possesses the following modes of operation:
2B, 2D, 2F, 2K, 2J, 2V, 2N, 2P software class C
H
This excerpt contains references to the complete standard DIN EN ISO 13849-1:2008-12, which are therefore not
reproduced in this chapter.
Table 9:
Safety feature Requirement / comment