Exception Response; Example Of An Exception Response Of Command Code 06H And Exception Code 02H; The Explanation Of Exception Codes - Delta VFD-B User Manual

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3.6 Exception response:

The AC motor drive is expected to return a normal response after receiving command messages
from the master device. The following depicts the conditions when no normal response is replied to
the master device.
The AC motor drive does not receive the messages due to a communication error; thus, the AC
motor drive has no response. The master device will eventually process a timeout condition.
The AC motor drive receives the messages without a communication error, but cannot handle
them. An exception response will be returned to the master device and an error message "CExx"
will be displayed on the keypad of AC motor drive. The xx of "CExx" is a decimal code equal to the
exception code that is described below.
In the exception response, the most significant bit of the original command code is set to 1, and an
exception code which explains the condition that caused the exception is returned.

Example of an exception response of command code 06H and exception code 02H:

Address Low
Address High
Function Low
Function High
Exception code
LRC CHK Low
LRC CHK High
END 1
END 0

The explanation of exception codes:

Exception
code
01
02
03
04
Revision July 2008, BE16, SW V4.08 & V5.00
Address
2201H User-defined (Low word)
2202H User-defined (High word)
2203H AVI analog input (XXX.XX %)
2204H ACI analog input (XXX.XX %)
2205H AUI analog input (XXX.XX %)
2206H Display temperature of heatsink (°C)
ASCII mode:
STX ':'
'0'
'1'
'8'
'6'
'0'
'2'
'7'
'7'
CR
LF
Explanation
Illegal function code:
The function code received in the command message is not
available for the AC motor drive.
Illegal data address:
The data address received in the command message is not
available for the AC motor drive.
Illegal data value:
The data value received in the command message is not available
for the AC drive.
Slave device failure:
The AC motor drive is unable to perform the requested action.
Chapter 5 Parameters|VFD-B Series
Function
RTU mode:
Address
Function
Exception code
CRC CHK Low
CRC CHK High
01H
86H
02H
C3H
A1H
5-93