JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual - Manual (Page 58)

6 Safety Manual
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6.11.1 DIN EN ISO 13849-1 Performance Level calculations – low voltage 230 V
6.11.2 DIN EN ISO 13849-1 Performance Level calculations – extra low voltage (ELV) 24 V
Table 12:
Variant MTTF
d
DC
avg
CCF PL
1 100 years 3 (336 years) 90 % 80 PLd
1a 100 years 3 (336 years) 90 % 80 PLe
2 100 years 3 (339 years) 90 % 80 PLe
3 100 years 3 (316 years) 90 % 80 PLe
4 100 years 3 (312 years) 90 % 80 PLe
5 100 years 3 (326 years) 91 % 80 See above table
Table 13:
Variant MTTF
d
DC
avg
CCF PL
1 100 years 3 (335 years) 90 % 80 PLd
1a 100 years 3 (335 years) 90 % 80 PLe
2 100 years 3 (338 years) 90 % 80 PLe
3 100 years 3 (314 years) 90 % 80 PLe
4 100 years 3 (304 years) 90 % 80 PLe 3. The MTTF d value of a subsystem must be
limited to 100 years according to the DIN EN
ISO 13849-1 requirements.
5 100 years 3 (317 years) 90 % 80 See above table