CMND Instruction Command Format Error

What does 10-04 mean?

This error signifies that the command sent by the CMND instruction has an incorrect format or structure, preventing the communication unit from processing it correctly. This indicates a malformed FINS command, where the structure of the data sent does not comply with the expected protocol.

• Incorrectly formatted command data in the CMND instruction's 'S' operand (S: CIO 5020).
• Invalid or unsupported command code (S) specified for the communication unit.
• Mismatch between the number of command data bytes (C) and the actual data provided in the 'S' operand.

Click steps to track your progress.

1. 1

   Review the setting contents of the first command word S (S: CIO 5020) and verify the Command code (S) is #2804 for Modbus-RTU communication.

2. 2

   Check the Number of command data bytes (C: CIO 5010) and ensure it accurately reflects the actual data length provided in the 'S' operand (e.g., #0008 for 8 bytes).

3. 3

   Cross-reference the FINS command structure with the CJ Series Communications Commands REFERENCE MANUAL (Cat. No. W342) if the command is non-standard.