How to Retrieve Detailed Fault Information from A6 Series Drives via Modbus RTU Communication?

For the A6 series servo drives, whenever a fault occurs, the drive's display panel shows a specific fault code (e.g., Er.xxx). This code allows us to identify the specific fault type and its cause.

So, can this fault code also be retrieved via Modbus for the A6-RS series drives? The method is as follows:

Within the drive's U41 parameter group (Status Monitoring), there is a specific parameter for the fault status: U41.01.

The value of U41.01 corresponds directly to the specific fault information. The correspondence is as follows:

For example, if the drive's panel currently displays Er.010, then the value of U41.01 would be 10. Reading this via a Modbus RTU command would use the instruction:

01 03 41 01 00 01 [CRC] [CRC]

The data returned from register address 4101 would be 00 10 (hexadecimal), which corresponds to decimal 16, indicating the specific fault code Er.010 according to the drive's fault mapping table.

Updated on: 28/11/2025