Mitsubishi Electric FR-D700 Instruction Manual page 207

Error response
An error response is returned if the query message received from the master has an illegal function, address or data.
No response is returned for a parity, CRC, overrun, framing or busy error.
NOTE
No response message is sent in the case of broadcast communication also.
Error response (Response message)
1) Slave Address 2) Function
H80 + Function
(8bit)
Message
1) Slave Address
2) Function
3) Exception Code
Error code list
Code Error Item
ILLEGAL FUNCTION
01
(Function code illegal)
ILLEGAL DATA ADDRESS ∗1
02
(Address illegal)
ILLEGAL DATA VALUE
03
(Data illegal)
∗1
An error will not occur in the following cases.
1) Function code H03 (Read holding register data)
When the No. of Points is 1 or more and there is one or more holding registers from which data can be read
2) Function code H10 (Write multiple holding register data)
When the No. of Points is 1 or more and there is 1 or more holding registers to which data can be written
Namely, when the function code H03 or H10 is used to access multiple holding registers, an error will not occur if a non-existing holding register
or read disabled or write disabled holding register is accessed.
REMARKS
An error will occur if all accessed holding registers do not exist.
Data read from a non-existing holding register is 0, and data written there is invalid.
Message data mistake detection
To detect the mistakes of message data from the master, they are checked for the following errors.
If an error is detected, a trip will not occur.
Error check item
Error Item
The data received by the inverter differs from the
Parity error
specified parity (Pr. 334 setting).
The data received by the inverter differs from the
Framing error
specified stop bit length (Pr. 333).
The following data was sent from the master before
Overrun error
the inverter completes data receiving.
The message frame data length is checked, and the
Message frame error received data length of less than 4 bytes is regarded
as an error.
A mismatch found by CRC check between the
CRC check error message frame data and calculation result is
regarded as an error.
Communication operation and setting
3) Exception Code
(8bit)
(8bit)
Address received from the master
Master-requested function code + H80
Code in the following table
The set function code in the query message from the master cannot be
handled by the slave.
The set register address in the query message from the master cannot be
handled by the inverter.
(No parameter, parameter read disabled, parameter write disabled)
The set data in the query message from the master cannot be handled by the
inverter.
(Out of parameter write range, mode specified, other error)
Error Description
CRC Check
L H
(8bit) (8bit)
Setting Description
Error Description
Inverter Operation
1) Pr.343 is increased by 1 at error
occurrence.
2)The terminal LF is output at error
occurrence.
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