SI-Safety Installation & Operating Manual
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Issue Number: 1
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Index
Figure 3-4 Non grouped inputs
The SI-Safety module provides extensive diagnostic functions for the input sub system.
These functions are performed continuously, and/or optionally, i.e. cross-fault
monitoring using impulse detection.
This means that the following input sensor diagnostic functions can always be used in
any technical safety assessment of the complete system:
Table 3-2 Digital input signals
Measure
DC
Comment
Use
Cyclical test impulse through
dynamic change to the input
signals
90 %
Only effective if pulse
assignment is active
cross-fault monitoring
for single channel
sensors
Crosscheck of input signals
with a dynamic test, if no
short circuits can be
detected (on multiple inputs/
outputs)
90 %
Cyclical change in
input signals required,
e.g. by the process or
through regular
actuation
Monitoring of two
channel sensors
Crosscheck of input signals
with immediate and interim
results in the logic unit (L)
and time wise and logical
program runtime monitoring,
and detection of static
failures and short circuits (on
multiple inputs and outputs)
99 %
Only effective if pulse
assignment is active
Monitoring of two
channel sensors
Plausibility check, e.g. use of
NO and NC contacts on
restraint guided relays
99 %
Only effective in
conjunction with
activated monitoring
function for the input
element
Monitoring of two
channel,
complementary
sensors
Actuator
Sensor
PES
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