Mitsubishi Electric FR-A820-00046 Instruction Manual page 993

Parameters
Preset single register (writing data to holding registers) (H06 or 06)
● The content of the "system environmental variables" and "inverter parameters" assigned to the
holding register area (refer to the Modbus® register list (page 5-797)) can be written.
● Query message
³ Transaction
identifier
H
(8 bits)
● Normal response (Response message)
³ Transaction
identifier
H
(8 bits)
● Query message setting
Message
³ Transaction identifier
· Protocol Identifier
» Length field
¿ Unit identifier
´ Function
² Register address
¶ Preset data
Tab. 5-372: Description of the query message
● Content of normal response
With a normal response, the content is the same as in ³ to ¶ of the query message.
Example Write 60 Hz (H1770) to 40014 (running frequency RAM) of slave address 5 (H05).
Query message
Transaction
identifier
A given value is set.
Normal response (Response message)
Same data as query message.
FR-A800
· Protocol
» Length field
Identifier
L H L H
(8 bits) (8 bits) (8 bits) (8 bits)
· Protocol
» Length field
Identifier
L H L H
(8 bits) (8 bits) (8 bits) (8 bits)
Description
The master adds the data for the purpose of transaction control.
The same data is returned in the response from the slave.
Fixed to 0. (When the slave receives data other than 0, it does not send the response
message.)
0 is returned in the response from the slave.
The data length from the unit identifier to the data is stored in byte.
Fixed to 255
Set H06.
Set the holding register address to write data to.
Register address = holding register address (decimal) - 40001
For example, when register address 0001 is set, data is written to holding register
address 40002.
Set the data to write to the holding register. Write data is fixed at 2 bytes.
Protocol
Identifier
H00 H00
(8 bits) (8 bits)
¿ Unit
´ Function
identifier
L
(8 bits)
(8 bits)
¿ Unit
´ Function
identifier
L
(8 bits)
(8 bits)
Unit
Length field identi-
fier
H00 H06 H05
(8 bits) (8 bits) (8 bits)
Ethernet communication (FR-A800-E)
² Register
address
H06 H L
(8 bits) (8 bits) (8 bits)
² Register
address
H06 H L
(8 bits) (8 bits) (8 bits)
Func-
Register address
tion
H06 H00 H0D
(8 bits) (8 bits) (8 bits)
¶ Preset data
H L
(8 bits) (8 bits)
¶ Preset data
H L
(8 bits) (8 bits)
Preset data
H17 H70
(8 bits) (8 bits)
5 - 791