schmersal PROTECT-PSC - Page 16

Overview
1
Instruction Manual PROTECT-PSC
V 2.6R01 / 04.19
1–8
1.7.1 Risk graph
Starting from the left, 3 criteria are used in a tree structure to determine the
required PL (PL
r
for required Performance Level).
F
F
i
i
g
g
u
u
r
r
e
e
1
1
-
-
2
2
R
R
i
i
s
s
k
k
g
g
r
r
a
a
p
p
h
h
t
t
o
o
d
d
e
e
t
t
e
e
r
r
m
m
i
i
n
n
e
e
t
t
h
h
e
e
r
r
e
e
q
q
u
u
i
i
r
r
e
e
d
d
P
P
L
L
Warning:
Use the property F
2
for the criterion F if the intervention is made more than once
per shift.
1.7.2 Determining the Performance Level
In order to determine the PL for the entire system, the PL for each individual
element of the functional chain (sensor  PROTECT-PSC  actuator) must be
known. The PL of the entire system can then be determined from the individual
performance levels using the algorithms described below.
Performance Level of the PROTECT-PSC
The PROTECT-PSC Sicherheits-Kleinsteuerung on its own (without the sensory
system connected upstream and the actuator system connected downstream)
satisfies all requirements of Performance Level e, Category 4 to ISO 13849–1 with
two channelled input/output circuitry.