Mitsubishi Electric FR-E700EX Instruction Manual page 230

Communication operation and setting
 Function diagnosis (H08 or 08)
A communication check can be made since the query message sent is returned unchanged as a response message
(function of sub function code H00).
Sub function code H00 (Return Query Data)
Query message
1) Slave Address
(8 bits)
Normal response (Response message)
1) Slave Address
(8 bits)
 Query message setting
Message
1) Slave Address
2) Function
3) Subfunction
4) Data
 Description of normal response
1) to 4) (including CRC check) of the normal response are the same as those of the query message.
NOTE
For broadcast communication, no response is returned in reply to a query. Therefore, the next query must be
made when the drive unit processing time has elapsed after the previous query.
 Write multiple holding register data (H10 or 16)
You can write data to multiple holding registers.
Query message
1) Slave
Address
FTunction
(8 bits)
Normal response (Response message)
1) Slave
2) Function
Address
(8 bits)
 Query message setting
Message
1) Slave Address
2) Function
3) Starting Address
4) No. of Points
5) Byte Count
6) Data
228
2) Function 3) Subfunction
H08 H00
(8 bits) (8 bits)
2) Function 3) Subfunction
H08 H00
(8 bits) (8 bits)
Address to which the message will be sent
Broadcast communication cannot be made (0 is invalid).
Set H08
Set H0000
Any data can be set if it is 2 bytes long. The setting range is H0000 to HFFFF
2)
3) Starting
Address
H10 H L
(8 bits) (8 bits) (8 bits)
3) Starting
Address
H10 H L
(8 bits) (8 bits) (8 bits)
Address to which the message will be sent
Setting of address 0 enables broadcast communication
Set H10
Address where holding register data write will be started
Starting address = Starting register address (decimal)-40001
For example, setting of the starting address 0001 reads the data of the holding
register 40002.
Number of holding registers where data will be written
The number of registers where data can be written is a maximum of 125.
The setting range is H02 to HFA (2 to 250).
Set a value twice greater than the value specified at 4).
Set the data specified by the number specified at 4). The written data are set in
order of Hi byte and Lo byte, and arranged in order of the starting address data,
starting address + 1 data, starting address + 2 data
4) Data
H00 H
(8 bits) (8 bits)
4) Data
H00 H
(8 bits) (8 bits)
Setting Description
5) Byte
4) No. of
Registers
Count
H L
(8 bits)
(8 bits) (8 bits)
4) No. of
CRC Check
Registers
H L L
(8 bits) (8 bits) (8 bits)
Setting Description
CRC Check
L L H
(8 bits) (8 bits) (8 bits)
CRC Check
L L H
(8 bits) (8 bits) (8 bits)
6) Data
H L ...
(8 bits) (8 bits) (n28 bits)
H
(8 bits)
CRC Check
L H
(8 bits) (8 bits)