A00710

CB communication error

Siemens · SINAMICS G120

What does A00710 mean?

Communication has been lost with the Communication Board (CB) within the drive. This indicates a potential hardware fault with the CB or its connection, preventing proper data exchange and potentially disrupting external communication protocols, leading to a loss of control or monitoring capabilities.

Common Causes

  • Loose or improperly seated communication board (CB) within its dedicated slot on the drive's main control board.
  • Damaged internal ribbon cable or connector between the CB and the drive's main control unit, preventing data exchange.
  • Hardware fault on the communication board itself preventing proper internal data processing or initialization.
  • Faulty main control board slot where the CB is inserted, leading to intermittent or complete communication loss.
  • Excessive vibration or shock in the industrial environment dislodging the CB or its electrical connection.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    1. Power down the drive completely, then carefully reseat the communication board (CB) in its slot, ensuring all connectors are firmly engaged.

  2. 2

    2. Visually inspect the internal ribbon cables and connectors between the CB and the main control board for signs of damage or incorrect connection.

  3. 3

    3. Temporarily swap the communication board (CB) with a known-good spare (if available) to determine if the board itself is faulty.

  4. 4

    4. Check diagnostic LEDs on the main control board and the CB (if present) for any specific error indications related to internal communication.

  5. 5

    5. Perform a drive firmware update to the latest compatible version, as internal communication issues can sometimes be resolved by software improvements.

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Verified technical data. Last updated: March 2026

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