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Chapter 5 Parameters|VFD-S Series
Revision August 2006, SE08, SW V2.61 5-73
Example of an exception response of command code 06H and exception code 02H:
ASCII mode: RTU mode:
STX ‘:’ ADR 01H
‘0’ CMD 86H ADR 1
ADR 0
‘1’ Exception code 02H
‘8’ CRC CHK Low C3H CMD1
CMD0
‘6’ CRC CHK High A1H
‘0’
Exception code
‘2’
‘7’ LRC CHK 1
LRC CHK 0
‘7’
CR END1
END0
LF
The explanation of exception codes:
Exception
code
Meaning
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
message
Meaning
5
e
served
6
AC drive busy:
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.
14
The command messages include the data that does not belong to ‘0’ to
‘9’, ‘A’ to ‘F except starting and end character (only for Modbus ASCII
mode).