Comm Loss

What does F81 mean?

Communication has been lost with an adapter or the connected network. This can be due to intentional disconnection, issues with wiring, or failure of a port expander or adapter. The drive's response to this loss is configured by parameter A105 [CommLoss Action].

• No communication detected from the control system or supervisory PLC.
• Serial communication port failure or incorrect settings (baud rate, parity).
• Master control unit offline or malfunction.
• Timeout on communication protocol (P0-24).

Click steps to track your progress.

1. 1

   Verify the physical wiring integrity and connections to the drive's communication port (RS485/DSI) and any associated port expanders or adapters.

2. 2

   Check if the communication adapter was intentionally disconnected; if so, adjust parameter A105 [CommLoss Action] to a suitable non-fault setting (e.g., 'Coast to Stop', 'Stop', 'Continu Last').

3. 3

   Inspect communication cables and connectors for any signs of physical damage or improper termination.

4. 4

   Confirm that communication parameters such as A103 [CommData Rate], A104 [CommNode Addr], and A107 [CommFormat] are correctly configured for the network.