Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 993 / 1218

Parameters Ethernet communication (FR-A800-E)
FR-A800 5 - 791
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
●
Normal response (Response message)
●
Query message setting
●
Content of normal response
With a normal response, the content is the same as in
to
!
of the query message.
Transaction
identifier Protocol
Identifier
Length field
Unit
identifier
Function
Register
address
!
Preset data
H
(8 bits)
L
(8 bits)
H
(8 bits)
L
(8 bits)
H
(8 bits)
L
(8 bits)
(8 bits)
H06
(8 bits)
H
(8 bits)
L
(8 bits)
H
(8 bits)
L
(8 bits)
Transaction
identifier Protocol
Identifier
Length field
Unit
identifier
Function
Register
address
!
Preset data
H
(8 bits)
L
(8 bits)
H
(8 bits)
L
(8 bits)
H
(8 bits)
L
(8 bits)
(8 bits)
H06
(8 bits)
H
(8 bits)
L
(8 bits)
H
(8 bits)
L
(8 bits)
Message Description
Transaction identifier
The master adds the data for the purpose of transaction control.
The same data is returned in the response from the slave.
Protocol Identifier
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.
Length field The data length from the unit identifier to the data is stored in byte.
Unit identifier Fixed to 255
Function Set H06.
Register address
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.
!
Preset data Set the data to write to the holding register. Write data is fixed at 2 bytes.
Tab. 5-372: Description of the query message
Example Write 60 Hz (H1770) to 40014 (running frequency RAM) of slave address 5 (H05).
Query message
Normal response (Response message)
Same data as query message.
Transaction
identifier
Protocol
Identifier
Length field
Unit
identi-
fier
Func-
tion
Register address Preset data
H00
(8 bits)
H00
(8 bits)
H00
(8 bits)
H06
(8 bits)
H05
(8 bits)
H06
(8 bits)
H00
(8 bits)
H0D
(8 bits)
H17
(8 bits)
H70
(8 bits)
A given value is set.