Manual – Controllers DHE/DHF/DHR21B (standard) and DHE/DHF/DHR41B (advanced)
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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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