Detection of short circuits in CAN bus error images

Detection of short circuits in CAN bus error images

Detection of short circuits in CAN bus error images

The robustness of the CAN bus is also based on its tolerance to short circuits occurring.
Below we summarize the possibilities and show how the CANtouch detects these errors.

CAN-Bus short-circuit

case

Description

Communication

CANtouch

Bus status

CANtouch

CAN level absolute

CANtouch

Measurement Participants

CANtouch

Bus wiring

Ok

CAN bus without errors

Yes

CANtouch_CAN-Bus-OK_Bus-Status_DE

CANtouch_CAN-Bus-OK_Level_DE

CANtouch_CAN-Bus-OK_Oszi_DE


CANtouch_CAN-Bus-OK_Bus wiring

Note I:Bus status: valid CAN telegrams available

Can_h
to
Can_v+

No

CANtouch_CAN_L_short_Vcc_bus Status_DE

CANtouch_CAN_H_short_CAN_V_absLevel_DE

Test setup without communication


CANtouch_CAN_H_short_CAN_V

Note V:Depending on the CAN transceiver type, some types can continue to communicate with this error

Note VI:depending on the level of voltage and the duration of the effect of the error (overheating of the CAN transceiver)

Note II:Bus status: statically recessive

Note IV:Measurement not possible without communication






Note III:Find errors when supply voltages are measured

Can_l
to
Can_v+

No

CANtouch_CAN_L_short_Vcc_Bus Status_DE (1)

CANtouch_CAN_L_short_CAN_V_absLevel_DE

Test setup without communication


CANtouch_CAN_L_short_CAN_V

Note V:Depending on the CAN transceiver type, some types can continue to communicate with this error

Note II:Bus status: statically recessive

Note IV:Measurement not possible without communication




Note III:Find errors when supply voltages are measured

Can_h
to
Vcc

Yes

CANtouch_CAN-Bus-OK_Bus-Status_DE

CANtouch_CAN_H_short_Vcc_Level_DE

CANtouch_CAN_H_short_Vcc_Oszi_DE

Note I:Bus status: valid CAN telegrams available

Note VII:Errors in difference signal not detectable

Note VIII:A wiring test with connected participants is not recommended. It provides undefined mistakes whose statements are difficult to judge. The displayed results depend heavily on the internal wiring of the participants.

Can_l
to
Vcc

No

CANtouch_CAN_L_short_Vcc_bus Status_DE

CANtouch_CAN_L_short_Vcc_Level_DE

Note II:Bus status: statically recessive

Note IV:Measurement not possible without communication

Note VIII:A wiring test with connected participants is not recommended. It provides undefined mistakes whose statements are difficult to judge. The displayed results depend heavily on the internal wiring of the participants.

Can_h
to
Can_v-

No

CANtouch_CAN_L_short_Vcc_Bus Status_DE (1)

CANtouch_CAN_H_short_CAN_V-_absLevel_DE

CANtouch_CAN_H_short_CAN_V-

Note II:Bus status: statically recessive

Note IV:Measurement not possible without communication

Note III:Find errors when supply voltages are measured

Can_l
to
Can_v-

Yes

CANtouch_CAN-Bus-OK_bus-status_DE

CANtouch_CAN_L_short_GND_Level_DE

CANtouch_CAN_L_short_GND_Oszi


CANtouch_CAN_L_short_CAN_V-_Bus wiring_DE

Note VII:Errors in difference signal not detectable

Note III:Find errors when supply voltages are measured

Can_h
to
Can_l

No

CANtouch_CAN_L_short_Vcc_bus status_DE

CANtouch_CAN_H_short_CAN_L_absLevel_DE

CANtouch_CAN_L_short_CAN_H_Buswiring_DE

Note II:Bus status: statically recessive

Note IV:Measurement not possible without communication

Legend:

Vcc: CAN transceiver supply voltage

Bus status: valid CAN telegrams available

II) Bus status: statically recessive

III) finds errors when supply voltages are measured

IV) Measurement not possible without communication

V) depending on CAN transceiver type, some types can continue to communicate with this error

VI) depending on the level of voltage and the duration of the effect of the error (overheating of the CAN transceiver)

VII) Errors in the difference signal cannot be detected

VIII) A wiring test with connected participants is not recommended.
It provides undefined mistakes whose statements are difficult to judge. The results displayed depend heavily on the internal wiring of the participants.

    • Related Articles

    • CANtouch vs. CAN bus tester 2, the decision.

      CANtouch vs. CAN bus tester 2, the decision. >> This article is obsolete with the release of the CAN bus tester GT3. Our new measuring device combines the properties of CANtouch and CAN bus Tester 2 and offers much more extensive analytical ...

    • CAN-wiring

      CAN-wiring The sequence of the wiring test raises questions from time to time. We would like to explain why the process is as it is. There are also a few tips. For the measurement, the CAN bus tester 2 must be operated at 24V. The process in CANtouch ...

    • Exchange service for fieldbus diagnostic equipment, end of service and calibrations

      Exchange service fieldbus diagnostics Actually, there are very few repairs to our equipment. Most influence. This is what our conscientious developers. In contrast to some other manufacturers, GEMAC attaches great importance to protecting the devices ...

    • CANBUSview XL III, CAN Quick Tester C‐QT15 and DeviceNet Analyzer

      CANBUSview XL III, CAN Quick Tester C‐QT15DeviceNet Analyzer (BC-200-CAN/DN) What is good is gladly taken. Several companies worldwide have added our diagnostic tools to their product portfolio. While companies likeIxxat...ProkormentandPhytoolssell ...

    • Repair, exchange service, complaints, customs shipping

      repair, Exchange service, complaints, customs shipping Please load the attached form before sending an article and fill it out completely. Please pay attention to our return instructions (see Annex). Please send your package only after consulting our ...