Use As Optical Warning System Without Test Function - Pfannenberg PMF 2015-SIL Instructions De Service

The optical warning system with diagnosis function is implemented as follows:
a) A measurement (input (1), logic (2)) records a dangerous condition and activates the optical warning
system (output (3))
b) The diagnosis (4) monitors the function of the optical warning system and reports OK to a superior
control system (5)
c) If an OK message takes place, then the superior control system (5) introduces the safe condition via
other measures (6).
Recording
(Input)
Fig. 8 Warning system
The safety loop consists of position 1 to 6 in these one-channel architectures, as illustrated in Fig. 8. In sec-
tion 4.4.2.2 the flashing light partial systems (output - position 3) and diagnosis channel (diagnosis - position
4) are evaluated. It should be noted that the sum of all PFH or PFD values must correspond to the required
safety integration level for the entire system.

4.4.2.1. Use as optical warning system without test function

The safety function – generating a warning signal – is realised via a one-channel system (1oo1 according to
IEC/EN61508) without taking account of the diagnosis function, as also described in section 4.2.
Low and high requirement rates (low and high demand mode) are usable in the system without an automatic
test function.
T
ProofTest
PFD
mean
PFH
SFF
DC
MTTR
λ
flashing light
D
λ
flashing light
S
λ
diagnosis switch
DU
λ
diagnosis switch
S
β
λ
complete
DU
λ
complete
S
MTTF
d
HFT
Categorie (DIN EN ISO13849)
Architecture type
Suitability of the system for use in safety chains until
PL (DIN EN ISO13849)
*
Next to the proof test interval, 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.
Datei/ file name:085501931f D-E-F.doc
Evaluation
(Logic)
Superior
system
24V DC
1* 15*
-3 -2
2,92 x10 4,37 x10
24V DC
-7
6,66 x10
52
0
1
661
598
43
82
10%
666
718
>100
0
1
Typ A
SIL 1
c
22 / 44
Output
(Output)
Diagnosis
(Output)
Output
230V AC
1* 15*
-3 -2
2,14 x10 3,21x10
230V AC
-7
4,89 x10
60
0
1
484
603
50
85
10%
489
734
>100
0
1
Typ A
SIL 1
c
Zeichnungsnr./ Drwg-no.: 11516-42e
Year
(1/requirement)
(1/h)
%
%
h
Fit
Fit
Fit
Fit
Fit
Fit
Years