Option Communication Error

What does bUS mean?

An error has occurred in the communication with an installed option card, such as a fieldbus communication card. This can stem from the drive not receiving a signal from the controller, incorrect or damaged communication cable wiring (short-circuited or disconnected), or significant electrical interference. An improperly installed or physically damaged option card can also trigger this fault, preventing the drive from responding to external commands.

• Option card (e.g., fieldbus card) is improperly seated or loose in the drive's expansion slot.
• Mismatched fieldbus communication parameters (e.g., A1-01 address, A1-02 baud rate) between card and network.
• Damaged fieldbus communication cable, connectors, or improper termination.
• Failure of the master controller to establish communication with the option card.
• Faulty or incompatible option card hardware.

Click steps to track your progress.

1. 1

   Power down the drive, then remove and reinsert the option card firmly into its expansion slot.

2. 2

   Verify all option card communication parameters (e.g., A1-01 for Address, A1-02 for Baud Rate) match the fieldbus network settings.

3. 3

   Inspect the fieldbus communication cable for physical damage, proper shielding, and correct termination at both ends.

4. 4

   Use a fieldbus network analyzer to diagnose communication activity and identify polling failures.

5. 5

   Test the drive with a known good, compatible option card (if available) to rule out hardware failure.