Modbus Exception Response - Mitsubishi Electric AE630-SW Instruction Manual
Low-voltage air circuit breakers type ae, modbus interface unit bif-md
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Also See for AE630-SW:
- Instruction manual (120 pages) ,
- Instruction manual (26 pages) ,
- Instruction manual (43 pages)
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<Diagnostics（Function code :08H）（sub function code 00H）>
This function code is used for initial test of master's software.
Query framing
**H
08H
Slave
Function
address
Code
slave address
sub function code
data
CRC
Response framing
**H
08H
Slave
Function
address
Code
data
5.5 Modbus Exception Responses
ERROR
Framing error
Overrun error
Parity error
CRC error
Illegal function
Illegal data address
Illegal data value
Slave busy
*1 Addresses 02**h (0209h-02B9h) can be monitored even if internal transmission error has occurred.
Response framing
Slave address
function code *1
**H
*1 function code : In an exception response, the server sets the MSB of the function code to 1.
<Example>
function code in a query
03h
08h
10h
Mitsubishi Electric Corporation puts the maximum effort into making electric products better and more reliable, but generally
electric products may incorrect-operate under the influence of a noise etc.
In order not to cause abnormalities to a system by the influence of a noise etc., please retry 3 times or more with master
software in case of error reply or no reply.
00H
00H
sub function code
：1～7FH
：00H
：2 bytes
：2 bytes
00H
00H
sub function code
：same as the data of query
Meaning
Query framing was incorrect.
1 byte data length was incorrect.
1 byte data was incorrect.
Framing data were incorrect.
The function code received in the query
was except 03h, 08h and 10h.
The data address received in the query is
not an allowable address for the slave.
The data value received in the query is
not an allowable data for the slave.
Slave is busy on initial state or internal
transmission *1 cable is not connected.
Exception code
**H
**H
function code in an exception response
83h
88h
90h
CAUTION
E-20
Hi
Lo
Lo
data
Hi
Lo
Lo
data
Exception code
No response is returned.
Please retry with master
software.
01
02
03
06
Lo
Hi
CRC
Hi
CRC
Hi
CRC
Display
Modbus ERR. LED is
turned ON (flashing) until
receiving the correct query
in case of no error.
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