Content

Address

2201H

2202H

2203H

2204H

2205H

2206H

Chapter 5 Parameters|VFD-B Series

Function

User-defined (Low word)

User-defined (High word)

AVI analog input (XXX.XX %)

ACI analog input (XXX.XX %)

AUI analog input (XXX.XX %)

Display temperature of heatsink (°C)

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:

ASCII mode:

STX

‘:’

Address Low

‘0’

Address High

‘1’

Function Low

‘8’

Function High

‘6’

Exception code

‘0’

‘2’

LRC CHK Low

‘7’

LRC CHK High

‘7’

END 1

CR

END 0

LF

RTU mode:

Address

01H

Function

86H

Exception code

02H

CRC CHK Low

C3H

CRC CHK High

A1H

The explanation of exception codes:

Exception

code

Explanation

Illegal function code:

01

The function code received in the command message is not

available for the AC motor drive.

Illegal data address:

02

The data address received in the command message is not

available for the AC motor drive.

Illegal data value:

03

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.

Revision July 2008, BE16, SW V4.08 & V5.00

5-93