MEMOBUS/Modbus Communication Error

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A communication error has occurred on the MEMOBUS/Modbus network, preventing the drive from exchanging data correctly with a master controller or other devices. This can lead to loss of remote control, monitoring, or coordinated operation.

• Incorrect wiring or improper termination (e.g., missing or incorrect resistor values) on the MEMOBUS/Modbus network
• Incorrect communication parameters (e.g., slave address, baud rate, data format) in the drive (Parameters b2-01 to b2-04)
• Network interference or electrical noise affecting communication signals on the bus lines.

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1. 1

   Verify wiring connections (e.g., A/B lines, shield) and bus termination resistors on the Modbus network.

2. 2

   Check drive parameters for Modbus communication (e.g., b2-01 Slave Address, b2-02 Baud Rate, b2-03 Data Format) and ensure they match the network configuration.

3. 3

   Monitor communication line signals using an oscilloscope to detect noise or signal integrity issues.