Data type does not match parameter (Register 0007)

What does 05 mean?

The data type of the value being written (e.g., integer, float, text) through Holding Register 0007 does not match the expected data type of the parameter being called. This can lead to data corruption, misinterpretation, or a failure to apply the new setting correctly.

• Modbus master attempting to write a floating-point value (e.g., a speed of '50.5') to a drive parameter that expects an integer (e.g., '50').
• Attempting to write a string or text value to a numerical parameter (e.g., writing 'AUTO' to a frequency reference register).
• Byte order or word size mismatch between the Modbus master and the drive (e.g., big-endian vs. little-endian, 16-bit vs. 32-bit integer).
• A parameter defined as a bitfield or enumeration is being written with a raw numerical value that doesn't correspond to its defined options.
• Corruption in the Modbus communication leading to misinterpretation of the data type during the write operation to Holding Register 0007.

Click steps to track your progress.

1. 1

   Consult the drive's communication manual for the specific parameter to confirm its exact data type (e.g., integer, float, enumerated type).

2. 2

   Review the Modbus master's program (e.g., PLC code, HMI driver) to ensure the value being sent to Holding Register 0007 is converted to the correct data type.

3. 3

   Ensure correct byte order and word handling (e.g., for 32-bit values often requiring two 16-bit Modbus registers) is implemented in the Modbus master.

4. 4

   If the parameter is an enumerated type (e.g., 'ON', 'OFF', 'AUTO'), ensure the numerical equivalent (e.g., 0, 1, 2) is being sent, not the text string.

5. 5

   Temporarily use a Modbus scanner tool to manually write known correct data types (e.g., 16-bit integer) to the parameter to isolate the issue.