Delta Electronics Network Device VFD-S Especificaciones descargar pdf (Pagina 75)

VFD-S Series

5-58

3.6 Exception response:

Except for broadcast messages, the AC drive is been expected to return a normal

response after receiving command messages from the master device. The following

depicts the conditions that no normal response is replied to the master device.

The AC drive does not receive the messages due to a communication error; thus, the

AC drive has no response. The master device will eventually process a timeout

condition.

The AC drive receives the messages without a communication error, but cannot handle

it, an exception response will return to the master device and an error message “CExx”

will display on the keypad of AC drive. The xx of “CExx” is a decimal code equal to the

exception code that will describe below.

In the exception response, the most significant bit of the original command code is set to

1, and an exception code explains the condition that caused the exception is returned.

An example of exception response of command code 06H and exception code 02H:

ASCII mód: RTU mód:

STX ‘:’ ADR 01H

‘0’ CMD 86H ADR 1

ADR 0

‘1’ Exception code 02H

‘8’ CRC CHK Low C3H CMD 1

CMD 0

‘6’ CRC CHK High A1H

‘0’

Exception code

‘2’

‘7’ LRC CHK 1

LRC CHK 0

‘7’

CR END 1

END 0

The meaning of exception code:

Exception

code

Jelentése

Illegal command code:

The command code received in the command message

is not available for the AC drive.

Illegal data address: The data address received in the command message is not

available for the AC drive.

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.

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