Use As Acoustic Warning System When Hazardous Statuses Are Detected - Pfannenberg DS5-SIL Instructions De Service

Fig. 6 Safety relevant block diagram
PFH
SFF
DC
MTTFd
λ
diagnosis circuit
DU
λ
diagnosis circuit
DD
λ
diagnosis circuit
S
HFT
Architecture type IEC/EN61508
Suitability of the system for use in safety chains until
Category (DIN EN ISO13849)
PL (DIN EN ISO13849

4.4.2. Use as acoustic warning system when hazardous statuses are detected

When used as a warning system following the detection of hazardous statuses, the generation of an acoustic warning
signal must be assessed as a safety function.
A measurement records a dangerous condition and introduces the safe condition by controlling the acoustic warning
system (personnel/operator is warned).
Note: The warning of people is a voluntary measure as it requires willing handling of one or more people. This archi-
tecture only corresponds to the requirements of the European Machinery Directive if, according to state-of-the-art
technology, no constructive safety or other voluntary measure is possible to reach a safe condition.
The diagnosis can only be taken into account if there is regular, automated function checking, the minimum interval of
which must be in accordance with approx. ten to one hundred times the requirement rate according to IEC/EN61508.
This possibility is only available in low demand mode and is further described and evaluated in section 4.4.2.2.
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-9
3,9 x 10 1/h
99 %
94,9 %
>100 years
4 Fit
73 Fit
7459 Fit
0
B
2
2
d
Drwg-no.: 30007-008-12j