Self-diagnosis Fault of Communication Option Card

What does CPF21 mean?

A self-diagnosis fault of the communication option card occurred, possibly due to noise or spikes on the communication line or a defective option board itself. This fault indicates a critical internal problem with the communication option card, leading to communication failure.

• Excessive electrical noise or transient spikes on the communication bus connected to the option card.
• Internal hardware failure of the communication option card's processor or diagnostic circuitry.
• Incorrect communication parameters (e.g., baud rate, parity) causing the card to fail its self-check.
• Poor grounding of the communication line, leading to common-mode noise affecting the card's integrity.
• Firmware corruption specifically on the communication option card.

Click steps to track your progress.

1. 1

   1. Power down the drive, remove the communication option card, inspect its connector, and re-seat it firmly.

2. 2

   2. Inspect the communication cabling (e.g., RS-485, Ethernet) for proper shielding, grounding, and connection integrity.

3. 3

   3. Verify that communication parameters (e.g., Parameter P5-01, P5-02 if using internal serial) are correctly configured.

4. 4

   4. Temporarily disconnect the communication cable from the option card to isolate external noise sources.

5. 5

   5. Try a known-good communication option card of the same type to rule out the card itself being defective.

6. 6

   6. If the fault persists, replacement of the communication option card is necessary.