
Manual – Controllers DHE/DHF/DHR21B (standard) and DHE/DHF/DHR41B (advanced)
69
6
Diagnostic procedure CAN 1/CAN 2 system bus
Error Diagnostics
6
Error Diagnostics
6.1
Diagnostic procedure CAN 1/CAN 2 system bus
Diagnostic problem:
Communication via system bus CAN 1 or CAN 2 does not work.
Initial status:
•
System bus CAN 1 or CAN 2 is connected correctly.
•
Communication via system bus CAN 1 or CAN 2 is programmed.
↓
Is the bus connector
plugged in?
No
→
[A]
Yes
↓
Response of the LEDs CAN
1 or CAN 2 state?
Orange
→
[B]
Green
→
[C]
Lights up or flashes red
↓
System bus CAN 1 or CAN 2 is not operating
or communication of the system bus is faulty.
↓
[A]
↓
Check the set baud rate.
↓
Baud rate OK?
No
→
[D]
Yes
↓
Make sure that terminating resistors are connected
properly.
[A]
Check the bus cabling.
[B]
System bus CAN 1 or CAN 2 is being initialized.
[C]
Bus communication is OK.
↓
Check the application program.
[D]
Correct the baud rate.
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