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Introduction
1
1
1.5 Symbols, Abbreviations and Conventions
Abbreviation
Cat.
DC
FIT
HFT
MTTFd
PFH
PFD
PL
SFF
SIL
STO
SS1
SRECS
SRP/CS
PDS/SR
Table 1.2 Abbreviations Related to Functional Safety
Conventions
Numbered lists indicate procedures.
Bullet lists indicate other information and description of illustrations.
Italicised text indicates
•
cross reference
•
link
•
parameter name
4
Operating Instructions
Reference
Description
EN ISO 13849-1
Category, level "B, 1-4"
Diagnostic Coverage
Failure In Time: 1E-9/hour
EN IEC 61508
Hardware Fault Tolerance: HFT=n means that n+1 faults could cause a loss of the safety
function
EN ISO 13849-1
Mean Time To Failure - dangerous. Unit: years
EN IEC 61508
Probability of Dangerous Failures per Hour. Consider this value if the safety device is
operated in high demand or continuous mode of operation, where the frequency of
demands for operation made on a safety-related system is greater than one per year.
EN IEC 61508
Average probability of failure on demand, value used for low demand operation.
EN ISO 13849-1
Discrete level used to specify the ability of safety related parts of control systems to
perform a safety function under foreseeable conditions. Levels a-e.
EN IEC 61508
Safe Failure Fraction [%]; percentage of safe failures and dangerous detected failures of
a safety function or a subsystem related to all failures.
EN IEC 61508
Safety Integrity Level
EN IEC 62061
EN IEC 61800-5-2
Safe Torque Off
EN IEC 61800-5-2
Safe Stop 1
EN IEC 62061
Safety Related Electrical Control System
EN ISO 13849-1
Safety Related Parts of Control Systems
EN IEC 61800-5-2
Power Drive System (Safety-related)
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