Network Loss

What does F71 mean?

This fault occurs when communication is lost with the drive over the configured network. This could be due to physical disconnection, network configuration issues, or a problem with the communication adapter.

• Physical disconnection of the network cable (e.g., Ethernet, DeviceNet, ControlNet) from the drive or the network switch/controller.
• Incorrect network IP address, subnet mask, or baud rate configured in the drive (e.g., P12-05 [IP Address], P12-06 [Subnet Mask]).
• Faulty network cable (e.g., broken conductor, poor shielding), causing intermittent or complete loss of communication signals.
• Network infrastructure issue (e.g., faulty switch port, overloaded network, incorrect termination resistor settings for fieldbus networks).
• PLC/controller communication module failure or incorrect program logic disabling network communication.

Click steps to track your progress.

1. 1

   Verify physical network cable connection at both the drive and the network switch/controller; ensure connectors are secure and undamaged.

2. 2

   Check the drive's network adapter status LEDs for communication activity or error indications (e.g., green for good, red for error).

3. 3

   Confirm network configuration parameters in the drive (e.g., P12-05 [IP Address], P12-06 [Subnet Mask], P12-07 [Gateway Address]) match the network scheme.

4. 4

   Perform a network ping test to the drive's IP address from a connected computer or PLC to verify network connectivity at the IP layer.

5. 5

   Temporarily replace the network cable with a known good cable to rule out cable damage as the cause.

6. 6

   For fieldbus networks (e.g., DeviceNet), verify proper termination resistor presence and placement at the network ends.