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In a fail-safe I/O with outputs, the F-system does not transmit the output values
provided by the safety program in the process image to the fail-safe outputs in the
event of a passivation but sends substitute values (e.g., 0) instead.
Average Probability of Failure on Demand
Average probability of failure of a safety function with low demand
Probability of Failure per Hour
Operating mode with high requirement rate or continuous demand. Probability of
dangerous failure per hour.
PROFIBUS Nutzer Organisation e.V.
manufacturer independent, open field bus standard
PROFINET is the open Industrial Ethernet Standard of the PROFIBUS User
Organization for automation.
Safety Integrity Level: Four discrete levels (SIL1 to SIL4). The higher the SIL of a
safety instrumented system, the lower the probability that the system cannot
execute the required safety functions.
Safety Instrumented System: is used to safeguard a dangerous process and
reduce the risk of an accident. Process instruments are part of a Safety
Instrumented System. They consist of the essential components of an entire
safety-relevant process I/O unit:
Sensor, fail-safe processing unit (controller) and actuator
Addressing a physical slot
Simple Network Management Protocol
Sound Retrieval System with control function with respect to
PROFIsafe also referred to as F Host
Transmission Control Protocol
Verband der Elektrotechnik, Elektronik und Informationstechnik (Association for
Electrical, Electronic and Information Technologies e.V.)
Recurrent test for detecting hidden dangerous failures in a safety instrumented
system.
EXtensible Markup Language
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