Network Loss

Was bedeutet F71 ?

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.

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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.