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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

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.

Browse all codes in this manual (109)
Verified technical data. Last updated: April 2026

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Source: Siemens SINAMICS G120
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