Instruction Manual PROTECT-PSC
V 2.6R01 / 04.19
1
–9
Performance Level of the entire system
When determining the PL of the entire system a series connection of N elements
whose PL is already known is assumed.
F
F
i
i
g
g
u
u
r
r
e
e
1
1
-
-
3
3
S
S
e
e
r
r
i
i
e
e
s
s
c
c
o
o
n
n
n
n
e
e
c
c
t
t
i
i
o
o
n
n
o
o
f
f
s
s
a
a
f
f
e
e
t
t
y
y
r
r
e
e
l
l
e
e
v
v
a
a
n
n
t
t
p
p
a
a
r
r
t
t
s
s
o
o
f
f
a
a
c
c
o
o
n
n
t
t
r
r
o
o
l
l
s
s
y
y
s
s
t
t
e
e
m
m
Firstly, the element with the lowest PL in the entire system is determined. This PL
(PL
low
) is a starting point for the further determination of the overall PL.
Afterwards, the number N
low
≤ N of the elements is determined using PL=PL
low
.
The PL of the entire system can then be determined using these two factors and
Table 1-1.
PL
low
N
low
PL
a
> 3
none, not permit
≤ 3
a
b
> 2
a
≤ 2
b
c
> 2
b
≤ 2
c
d
> 3
c
≤ 3
d
e
> 3
d
≤ 3
e
T
T
a
a
b
b
l
l
e
e
1
1
-
-
1
1
D
D
e
e
t
t
e
e
r
r
m
m
i
i
n
n
a
a
t
t
i
i
o
o
n
n
o
o
f
f
t
t
h
h
e
e
P
P
L
L
o
o
f
f
a
a
n
n
e
e
n
n
t
t
i
i
r
r
e
e
s
s
y
y
s
s
t
t
e
e
m
m
.
.
The values used for calculation are based on reliable values for the center of each
PL.
SRP/CS
1
PL
1
SRP/CS
2
PL
2
SRP/CS
3
PL
3
SRP/CS
PL
SRP/CS = Safety-Related Part of a Control System
Summary of Contents for PROTECT-PSC
Page 4: ......
Page 8: ......
Page 112: ......
Page 132: ......
Page 252: ......
Page 265: ...Annex 8 Instruction Manual PROTECT PSC V 2 6R01 04 19 8 5 8 3 EC Type Examination certificate ...
Page 266: ...Annex 8 Instruction Manual PROTECT PSC V 2 6R01 04 19 8 6 8 4 Declarations of conformity W ...
Page 267: ...Annex 8 Instruction Manual PROTECT PSC V 2 6R01 04 19 8 7 8 5 Index ...
