
26
14 Terms and abbreviations
ESPE
Electro-Sensitive Protective
Equipment
Cat�
Category
Classification of the safety-related
parts of a controller as regards their
resistance to failures�
CCF
Common Cause Failure
DC
Diagnostic Coverage
MTTF
Mean Time to Failure
MTTF
d
Mean Time To Dangerous
Failure
OSSD
Output Signal Switching Device Output signal switch element,
static safety-related output�
PFH
(PFH
D
)
Probability of (dangerous)
Failure per Hour
PL
Performance Level
PL to EN ISO 13849-1
SIL
Safety Integrity Level
SIL 1-4 to IEC 61508
PLC
Programmable Logic Controller
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Содержание G2001S
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