Communication Network Interruption

What does CnF mean?

Indicates an interruption in communication with an NET option card. The fault code remains saved even if the cause disappears and is reset only after a power cycle. This prevents remote control or monitoring, leading to a loss of control over the connected equipment.

• Physical disconnection of the network cable (e.g., Ethernet, Profibus) from the NET option card on the drive.
• Faulty NET option card itself, preventing it from properly processing network messages.
• Incorrect network address or subnet mask configuration (e.g., Parameter P8-01, P8-02) for the option card.
• Loss of power to the network segment or the master device controlling the network communication.
• Excessive network traffic, collisions, or severe EMI (Electromagnetic Interference) leading to missed communication packets.

Click steps to track your progress.

1. 1

   1. Power cycle the drive to clear the saved fault code from the display and internal memory.

2. 2

   2. Verify the physical connection of the network cable (e.g., RJ45 connector) to the NET option card on the drive.

3. 3

   3. Check the status LEDs on the NET option card for indications of link activity or error states (e.g., Link/Act LED, Error LED).

4. 4

   4. Confirm the network address (e.g., Parameter P8-01) and communication settings match the network master's configuration.

5. 5

   5. Use network diagnostic tools (e.g., a network scanner, ping command) to verify communication with the drive's option card address.