Installation manual
Page 29 of204
The following diagnoses for input sensors can generally be used for the safety related
assessment of the entire system:
Input element
characteristic
Parameterized /
operational tests
DC
Definition of measure Note
Cros
s
-s
h
o
rt
in
g
te
s
t
Wi
th
t
im
e
-out
Sta
rt
te
s
t
Cy
c
lic
t
e
s
t
d
u
ri
n
g
o
p
e
ra
ti
o
n
Single-channel
O
O
>60
Cyclic test pulse by dynamic
change of input signals
A sufficiently high test
rate must be ensured.
X
90
Cyclic test pulse by dynamic
change of input signals
Only effective if pulse
assignment is active
X
O
O
90-99
Cyclic test pulse by dynamic
change of input signals
DC depending on
frequency of start /
cyclic test
DC = 90 test only in >
4 week intervals
DC = 99 test at least
1 x day / or 100-time
request rate
Dual channel
90
Cross-comparison of input
signals with dynamic test, if
short-circuits cannot be
detected (for multiple
inputs/outputs)
For fault exclusion
short-circuit up to
DC=99 possible
O
O
90-99
Cyclic test pulse by dynamic
change of input signals
DC depending on
frequency of start /
cyclic test
X
99
Cross-comparison of input
signals with immediate and
intermediate results in the
logic (L) and temporal as well
as logic program sequence
monitoring and detection of
static failures and short circuits
(for multiple inputs/outputs).
Only effective if pulse
assignment is active
X
99
Plausibility test, e.g. use of
normally open and normally
closed contacts = non-
equivalent signal comparison
of input elements.
Only effective in
connection with
activated time-out
function for input
element
Summary of Contents for PSCBR-C-10 Series
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