Sil Information (In English); System Requirements - Tele Radio Tiger Grundlegende Bedienungsanleitung

SIL INFORMATION (IN ENGLISH)

SYSTEM REQUIREMENTS

The product holds two safety-related functions that comply with the requirements for SIL3
according to IEC61508:
• Stop function: Deactivates all relays on the receiver when the STOP button on the
transmitter is pressed.
• Safe function: Activates the safe function relays on the receiver when both safe
buttons on the transmitter are pressed.
The two safety-related functions comply with the requirements for SIL3 according to IEC61508
only when they are a part of a complete end user system that complies with the requirements
for SIL3 according to IEC61508.
CONNECTING AND CONTROLLING THE SAFETY FUNCTIONS
The stop function controls the stop relays from the stop button. The safe function controls the
safe function relays from the two specific safe buttons. In order to comply with the require-
ments for SIL3 according to IEC61508, both safety-related functions shall use their correspond-
ing 2 relay outputs in an active redundant configuration in a safety-related application.
MEASURES FOR PROBABILITY OF HARDWARE FAILURES
Transmitter Stop function:
Probability of dangerous failure per hour
Fraction of total failure rate with dangerous
and detected consequence
Diagnostic coverage
Safe failure fraction
Common cause failure
Level of hardware fault tolerance
Proof test interval
Diagnostic test interval
Transmitter Safe function:
Probability of dangerous failure per hour
Fraction of total failure rate with dangerous
and detected consequence
Diagnostic coverage
Safe failure fraction
Common cause failure
Level of hardware fault tolerance
Proof test interval
Diagnostic test interval
4
λ
PFHd = 8.5 FITs (=
λ
= 357 FITs
dd
DC = 98.3%
SFF = 99.1 %
0 FIT
HFT = 1
10 years
Continuous
λ
PFH = 5.5 FITs (=
d
λ
= 255 FITs
dd
DC = 98.1%
SFF = 99.2 %
0.5 FIT
HFT = 1
10 years
Continuous
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