Delta VFD-M-D series User Manual

Chapter 5 Parameters|VFD-M-D Series
Revision Jan. 2007, MDE2, SW V1.05 5-85
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:
ASCII mode: RTU mode:
STX ‘:’ Address 01H
‘0’ Function 86H Address Low
Address High
‘1’ Exception code 02H
‘8’ CRC CHK Low C3H Function Low
Function High
‘6’ CRC CHK High A1H
‘0’
Exception code
‘2’
‘7’ LRC CHK Low
LRC CHK High
‘7’
CR END 1
END 0
LF
The explanation of exception codes:
Exception
code
Explanation
01
Illegal function code:
The function code received in the command message is not
available for the AC motor drive.
02
Illegal data address:
The data address received in the command message is not
available for the AC motor drive.
03
Illegal data value:
The data value received in the command message is not available
for the AC drive.
04
Slave device failure:
The AC motor drive is unable to perform the requested action.
10
Communication time-out:
If Pr.8-03 is not equal to 0.0, Pr.8-02=00~02, and there is no
communication on the bus during the Time Out detection period (set
by Pr.8-03), “cE10” will be shown on the keypad.
3.7 Communication program of PC:
The following is a simple example of how to write a communication program for Modbus
ASCII mode on a PC by C language.
#include<stdio.h>

Delta VFD-M-D series Specifications

General

Brand	Delta
Model	VFD-M-D series
Category	Controller
Language	English