DSI Net Loss

What does F071 mean?

Control over the Modbus or DSI communication link has been interrupted, meaning the drive has lost communication with its master controller via the DSI port. This prevents remote commands and monitoring, potentially causing the drive to fault or transition to a safe state based on its parameter settings.

• Broken or loose communication cable (e.g., RS-485 Modbus) connected to the drive's DSI port (Terminals T18, T19, T20).
• Master controller (e.g., PLC, HMI) stopped communicating or failed, causing a loss of Modbus polling to the drive.
• Incorrect communication parameters (e.g., baud rate P1-35, address P1-36, data format P1-37) set on the drive or the master controller.
• Excessive electrical noise or grounding issues on the DSI communication line, corrupting data packets and causing communication timeouts.
• Missing or improper termination resistors on the RS-485 network, leading to signal reflection issues.

Click steps to track your progress.

1. 1

   Verify the integrity and secure connection of the DSI communication cable to the drive's T18, T19, T20 terminals and the master controller.

2. 2

   Confirm the master controller (PLC/HMI) is operational and actively sending/receiving data from the drive, checking its communication status.

3. 3

   Verify the drive's DSI communication parameters (P1-35 Baud Rate, P1-36 Node Address, P1-37 Data Format) match the master controller's settings.

4. 4

   Check for proper grounding and shielding of the DSI cable to mitigate electrical noise interference.

5. 5

   Ensure appropriate termination resistors are installed at both ends of the RS-485 bus (typically 120 ohms).

6. 6

   Temporarily connect a known good Modbus/DSI device or a PC with DSI software to the drive to isolate the fault to the drive or the network.