Datasheet

PSR-PC20
106255_en_00 PHOENIX CONTACT 14
14 Application examples
Key:
Applications with the PSR-PC20
14.1 Application example 1 - SIL3
– Low-demand application
– Single-channel control
– Diagnostic supply voltage is present
Figure 12 Application example 1 - SIL3
SIS = Safety Instrumented System (safe control)
DC = Diagnostic Coverage according to IEC61508
(line/load diagnostics at DO)
DI = Digital input
DO = Digital output
A fault e.g.,open circuit or short circuit of the
load is reported by detuning the test pulse of
the safe controller.
K1
K2
M
24VL
DO DO DI
SIS
DC 90%
( )
13F
M1
32
( )
A1
A2
13F
14
PSR-PC20
A1'
14 14
31
( )
13
M
(N)
K1
K2
Data for the application example as 1001 structure
Equipment type A
HFT 0
SIL 3
SFF 99.68%

SD
0 FIT

SU
1660 FIT

DD
0 FIT

DU
5.392 FIT

Total
1666 FIT
MTBF 60 years
PFD
avg
2.36x10
-05
(for T1=1year)