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General information
1.2 Abbreviations and terms used
Diagnostic Coverage
DC
avg
Average diagnostic coverage
ESD
Electro Static Discharge
EU
European Union
EMC
ElectroMagnetic Compatibility
Functional
Part of the overall system safety, which depends on the correct functioning of safety-
safety
related systems for risk reduction. Functional safety is ensured when each safety
(FS)
function is executed as specified.
Fault
Compromise between the technical safety requirements and the theoretical possibility of
exclusion
an error occurring
HTL
High-Threshold-Logic
IEC
International Electrotechnical Commission
IEEE
Institute of Electrical and Electronics Engineers
ISO
International Standard Organization
Mean Time To Failure (dangerous)
MTTF
d
Mean time until dangerous failure
Average Probability of Failure on Demand
PFD
av
Average probability of failure of a safety function with low demand
Probability of Failure per Hour
PFH
Operating mode with high requirement rate or continuous demand. Probability of
dangerous failure per hour.
Probability of a dangerous Failure per Hour
PFH
D
Average probability of a dangerous failure per hour according to ISO 13849-1.
Performance Level, according to ISO 13849-1: Discrete level, which specifies the
PL
capability of safety-related parts of a control to execute a safety function under
foreseeable conditions.
Safety Integrity Level, according to IEC 62061: Four discrete levels (SIL1 to SIL4). The
SIL
higher the SIL of a safety-related system, the lower the probability that the system cannot
execute the required safety functions.
Safety Instrumented System: is used to protect a dangerous process and reduce the risk
of an accident. Process instruments are a constituent of a Safety Instrumented System.
SIS
This comprises the essential components of a complete safety-relevant process unit:
Sensor, fail-safe processing unit (control, evaluation device) and actuator
STP
Shielded Twisted Pair
Verband der Elektrotechnik, Elektronik und Informationstechnik (Association for
VDE
Electrical, Electronic and Information Technologies)
Repeat test
Repetitive test to detect hidden dangerous failures in a safety-related system.
(proof test)
Operating Manual PSEN enc sincos/HTL
1005022-EN-01
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