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The sources of malfunctions occuring in CAN bus systems operating with several bus-based stations
must be analysed systematically since faulty components or incorrect settings can give rise to negative
interactions with intact bus devices in the CAN bus system. These unwanted interactions can cause
error messages in fully functional bus devices, which will make fault detection even more difficult.
We recommend the following systematic fault finding procedure:
Systematic malfunction analysis
System malfunctions
- continued -
Step 1 (Start)
Detach terminal strips of
all bus-based sensors!
Level electrode
Conductivity electrode
Pressure sensor
Temperature sensor
etc.
Step 3
Apply mains voltage to
all bus devices in the
system e. g.
LRR ...
and
LRG ...
!
Step 2
Plug in terminal strip
of the measuring
sensor of a system
e. g.
LRR ...
and
LRG ...
(electrode)!
System O.K.
Detach terminal strips
between the
bus devices of the
system e. g.
LRR ...
and
LRG ...
!
System fault
Use fault-finding
list to identify
the fault(s).
Cut off power supply
to the equipment!
Check
Use fault-finding list
to correct the
fault(s).
Final check:
Have all faults been
eliminated?
Check next system
