Modbus Master Command Slave Error Code

What does I xx .Command yy .SlaveErrorCode mean?

This boolean tag indicates that the Modbus slave device returned an error code (distinct from an exception code) in response to a specific Modbus master command (Command yy). A value of 1 (Occurrence) means the slave device reported an internal issue or invalid request. This requires investigating the slave device's status or the command itself.

• Invalid data or parameter in the Modbus command (e.g., out-of-range register address, unsupported function code)
• Modbus slave device internal processing error or transient fault
• Modbus slave device configuration mismatch preventing proper command execution

Click steps to track your progress.

1. 1

   Review the Modbus command (Command yy) to ensure valid addresses and data are being requested or written.

2. 2

   Consult the Modbus slave device's manual for specific error code meanings and troubleshooting procedures.

3. 3

   Verify the Modbus slave device's configuration and operational status.