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
Содержание EFC 3610 Series
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