Use As An Optical Warning System In One-Channel Version - Pfannenberg PMF 2015-SIL Instructions De Service

the figurative sense, clearly tested more than it is required (T
control system and corresponding measures for fault messages must be in accordance with the functional
safety according to IEC/EN61508.
The safety loop is made up of diagnosis channel with recording (4), evaluation of the dangerous condition (2)
and elements of the machine control (5) for the reaching of the safe condition. The latter was not taken into
account in the analysis.
Warning signal
Action
Fig. 6 Starting alarm
Fig. 7 Safety relevant block diagram
PFH
SFF
DC
MTTFd
λ
diagnosis switch
DU
λ
diagnosis switch
DD
λ
diagnosis switch
S
HFT
Category (DIN EN ISO13849)
Architecture type
Suitability of the system for use in safety chains until
PL (DIN EN ISO13849)
*
The lifetime of the flashtube is to be observed as specified in the technical data. The number of executed flashes is pivotal for the
lifetime. This is to be taken into account in the respective use.

4.4.2. Use as an optical warning system in one-channel version

The function of the optical warning system is to be assessed as a safety function in the use as a warning
system after recording dangerous conditions. A measurement records a dangerous condition and introduces
the safe condition by controlling the optical 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 architecture 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 accord-
ing to IEC/EN61508. This possibility is only available in low demand mode and is further described and eval-
uated in section 4.4.2.2.
Datei/ file name:085501931f D-E-F.doc
Requirement
Control
Flashing light
Diagnosis
channel
Diagnosis
21 / 44
<<T ). Test functions in the superior
Test required
24V DC 230V AC
-10
4,27 x 10 4,99 x 10
99,66 99,63
99 99
>100 >100
0,5 0,5
48 49,5
51 85
0 0
2 2
B B
SIL 2 SIL 2
d d
Zeichnungsnr./ Drwg-no.: 11516-42e
Safety
relais
Maschine start
-10
(1/h)
%
%
years
Fit
Fit
Fit