Modbus services
Error response
An error response is returned by the Altivar 212 when it is unable to perform the request.
Format of an error response:
Slave | Function code | Exception code |
| CRC16 | |
no. |
|
| Lo |
| Hi |
|
|
| |||
|
|
|
|
|
|
1 byte | 1 byte | 1 byte |
| 2 bytes |
Function code: request code + H’80.
Exception code:
Exception Code | Description |
|
|
01 | Unknown function: |
| The function code received in the query is not an allowable action for the drive. |
| - The function is not supported by the drive error. |
| - Function code 43 but MEI Type not equal: to 14. |
|
|
02 | Illegal data address:The data address received in the query is not an allowable address for the drive. |
| - Modbus address is not supported. |
| - Request to write a read only parameter. |
|
|
03 | Illegal data value: |
| A value contained in the query data field is not an allowable value for the drive. |
| - Data range not allowed. |
| - Fixed data not allowed. |
| - Function code 43 and MEI Type 14 but invalid Read Device ID Code (Read Dev ID code > 3). |
04Unable to execute:
The request commands an operation that the Altivar 212 is not able to execute due to another task or condition.
-Request to write in a parameter that cannot be changed during running.
-Request to write during executing "tyP" (return to factory setting ...).
-Interruption occurs during writing data.
S1A53844 01/2011 | 41 |