During the data communication over CAN bus systems it can come to DIN
to altogether 8 errors. These CAN errors result alone from errors in the
two data lines. Couches errors only in one of the two lines forwards,
switch the controllers to single-wire enterprise, the transmission of the
signals remain secured, however the line becomes sensitive in relation to
electromagnetic spurious signals. Errors in the CAN lines are to be
noticed toward outside only if both lines are disturbed, because then the
controllers concerned can react not more and fail systems, because
relevant data cannot be missing to them or pass them on their data. The
single-wire enterprise is put down into error memory of the controllers
concerned as error. A possibility of the fault-tracing is measuring by an
oscilloscope of the disturbed data lines. Ever after error different
patterns indicating defects result for CAN h and CAN l. With the help of
the CAN error box eight DIN errors on the CAN lines can be simulated. The
error box possesses eight switches, which are numbered of 1-8. The pupils
must by the diagnosis with the oscilloscope and the comparison with
patterns indicating defects (e.g. self study program NR. 269 "Data
exchange on the CAN data bus") finds out, which errors it concerns. Will
simply put the CAN error box with their patch cord into a card location of
the CAN function box, into the plug connector at the box can a further
construction unit be attached, so that through the error box no card
location is lost to the CAN function box.
Error switch Type of error
- Exchange CAN-High and CAN-Low
- Short-circuit CAN-Low to ground
- Short-circuit CAN-High to ground
- Interruption CAN-High and CAN-Low
- Short-circuit CAN-Low to plus
- Short-circuit CAN-High to plus
- Interruption CAN-Low
- Interruption
CAN-High
