19.6.6 Maintenance
For preventive maintenance, the STO function must be activated once a year.
The main power supply of the device must be turned off and then on again be-
fore this preventive maintenance. Active the STO function and confirm the oper-
ation and reaction of the STO function is normal.
19.6.7 Abbreviations
Abbreviation Reference Description
β IEC 61508
Fraction of undetected failures in the common cause failures mod-
el
βd IEC 61508 Fraction of detected failures in the common cause failures model
Category ISO 13849-1 Classification of the safety-related parts of a control system
FIT - Failure In Time: 1E-9 hours
HFT IEC 61508 Hardware fault tolerance
MTTFd ISO 13849-1
Mean Time To dangerous Failure: (The total number of life units) /
(the number of dangerous, undetected failures) during a particu-
lar measurement interval under stated conditions
PFH IEC 61508 Probability of Dangerous Failures per Hour
PL ISO 13849-1 Performance Level: Corresponds SIL, Levels a-e
PTI IEC 61508 Proof Test Interval
SC IEC 61508 Systematic capability
SFF IEC 61508 Safe failure fraction
SIL IEC 61508 Safety Integrity Level
SIL CL IEC 62061 Safety Integrity Level Claim Limit
STO IEC 61800-5-2 Safe Torque Off
Tab. 19-9: Abbreviations
Detailed description about each abbreviation, please refer to the
content of corresponding standard.
Bosch Rexroth AG
Appendix
EFC x610 Series
388/389
DOK-RCON03-EFC-X610***-IT05-EN-P
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