Chapter 5 ParametersVFD-S Series
Example of an exception response of command code 06H and exception code 02H:
ASCII mode:
STX | ‘:’ | |
ADR 1 | ‘0’ | |
ADR 0 | ‘1’ | |
CMD1 | ‘8’ | |
CMD0 | ‘6’ | |
Exception code | ‘0’ | |
‘2’ | ||
| ||
LRC CHK 1 | ‘7’ | |
LRC CHK 0 | ‘7’ | |
END1 | CR | |
END0 | LF |
The explanation of exception codes:
RTU mode:
ADR | 01H |
CMD | 86H |
Exception code | 02H |
CRC CHK Low | C3H |
CRC CHK High | A1H |
Exception | Meaning | |
code |
| |
1 | Illegal command code: The command code received in the command | |
message is not available for the AC drive. | ||
| ||
2 | Illegal data address: The data address received in the command | |
message is not available for the AC drive. | ||
| ||
3 | Illegal data value: The data value received in the command message | |
is not available for the AC drive. | ||
| ||
4 | Slave device failure: The AC drive is unable to perform the requested | |
action. | ||
|
The AC drive receives the messages, but detects a communication error, thus, no response is returned, but there will be error message “CExx” displayed on the keypad of AC drive. The master device will eventually process a timeout condition. The xx of “CExx” is a decimal code, the meaning of the error message is below:
Error | Meaning | |
message | ||
| ||
5 | served | |
| ||
| AC drive busy: | |
6 | The time interval between commands is too short. Please keep an | |
interval of 10ms at least after the return of a command. If no command | ||
| ||
| returned, please keep a 10ms interval at least for the same reason. | |
7 | Reserved | |
8 | Reserved | |
9 | Check Sum Error: Check if the Check Sum is correct. | |
10 | Watchdog Timer: The timer will reset to 0 after each valid Modbus | |
communication message is received. | ||
| ||
11 | Frame Error: Check if the Baud rate complies with the data format. | |
12 | The command message is too short. | |
13 | Command message length is out of range. | |
| The command messages include the data that does not belong to ‘0’ to | |
14 | ‘9’, ‘A’ to ‘F except starting and end character (only for Modbus ASCII | |
| mode). |
Revision August 2006, SE08, SW V2.61 |