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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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