Mitsubishi Electric 800 Series Instruction Manual page 62

*1 The values are the same as those in the query message.
Read value
Register 41004 (Pr.4): H1770 (60.00 Hz)
Register 41005 (Pr.5): H0BB8 (30.00 Hz)
Register 41006 (Pr.6): H03E8 (10.00 Hz)
 Write single register (writing data to holding registers) (H06 or 06)
• The content of the system environmental variables and inverter parameters (refer to
register area can be written. Query message
a. Transaction b. Protocol
identifier identifier
H L H
(8 bits) (8 bits) (8 bits)
• Normal response (Response message)
a. Transaction b. Protocol
identifier identifier
H L H
(8 bits) (8 bits) (8 bits)
• Query message setting
Message
a Transaction identifier
b Protocol identifier
c Length field
d Unit identifier
e Function code
f Register address
g Register value
• Content of normal response
With a normal response, the contents in the response are the same as those in (a) to (g) of the query message.
 Example) Write 60 Hz (H1770) to register 40014 (running frequency RAM) in the inverter.
Query message
Transaction
Protocol identifier
identifier
H00
*1 *1
(8 bits)
*1 A given value is set.
Normal response (Response message)
The same data as those in the query message
 Diagnostics (diagnosis of functions) (H08 or 08)
• A communication check can be made since the query message is sent and the query message is returned as it is as the
return message (subfunction code H00 function).
Subfunction code H00 (Return query data)
• Query message
a. Transaction b. Protocol
identifier identifier
H L H
(8 bits) (8 bits) (8 bits)
c. Length field
L H L
(8 bits) (8 bits) (8 bits)
c. Length field
L H L
(8 bits) (8 bits) (8 bits)
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.
Length field
H00 H00 H06
(8 bits) (8 bits) (8 bits)
c. Length field
L H L
(8 bits) (8 bits) (8 bits)
d. Unit e. Function
identifier code
H06
(8 bits)
(8 bits)
d. Unit e. Function
identifier code
H06
(8 bits)
(8 bits)
Description
Function
Unit identifier
code
HFF H06
(8 bits) (8 bits)
d. Unit e. Function
identifier code
H08
(8 bits)
(8 bits)
page 64) assigned to the holding
f. Register
g. Register Value
Address
H L H
(8 bits) (8 bits) (8 bits)
f. Register
g. Register Value
Address
H L H
(8 bits) (8 bits) (8 bits)
Register address Register value
H00 H0D H17
(8 bits) (8 bits) (8 bits)
f. Sub-function g. Data
H00 H00 H
(8 bits) (8 bits) (8 bits)
2. Ethernet Communication
2.7 MODBUS/TCP
1
2
3
4
L
(8 bits)
5
L
(8 bits)
6
7
8
9
10
H70
(8 bits)
L
(8 bits)
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