Mitsubishi Electric GOT2000 Series Connection Manual page 247


Address
GT Designer3 converts the device numbers into
decimal format according to the address map of the
®
MODBUS /RTU equipment to be used.
The table below shows the representations on the
®
MODBUS /RTU communication protocol and GT
Designer3.
MODBUS/RTU Communication protocol
Function code to be
used
Device name
Read Write
0x05
Coil 0x01
0x0F
Input relay 0x02 -
Input register 0x04 -
Holding 0x06
0x03
register 0x10
Extension file
0x14 0x15
register
POINT POINT POINT
Address conversion example
When monitoring the holding register's address
"1234H", GT Designer3 displays "4*****" since GT
Designer3 processes the internal conversion in
decimal format as follows:
GT Designer3 converts the holding register's address
"1234H" to "04660" in decimal format.
Then, "+1" is added to this decimal address since the
holding register's address on GT Designer3 always
starts from "1."
Therefore, the holding register's address "1234H" is
displayed as "404661" on GT Designer3.
Holding register
"4 04660" +1
Representation on GT
Designer3
Address
0000 000001
0001 000002
to to
FFFE 065535
FFFF 065536
0000 100001
0001 100002
to to
FFFE 165535
FFFF 165536
0000 300001
0001 300002
to to
FFFE 365535
FFFF 365536
0000 400001
0001 400002
to to
FFFE 465535
FFFF 465536
0000 600000
0001 600001
to to
270E 609998
270F 609999
1234H
"404661"

MODBUS communication control function on
the GS device
(1) Function overview
This function is to prevent the communication response
delay that occurs because the devices on the
MODBUS network differs from each other in network
specification.
This function is effective for the MODBUS network
conditions as described below:
• When only a part of function codes is supported
(Example: "0F" is not supported)
• When the maximum transfer size of function code is
small (Example: The maximum number of coil read
times is 1000)
(2) Communication setting
When the MODBUS/RTU communication driver is
assigned to multiple channel numbers using the multi-
channel function, the following cases are possible. The
communication settings are shared between the
assigned multiple channel numbers, or the individual
communication setting is configured to a specific
channel number.
By setting the device GS579, either the GS device used
for sharing communication settings (GS570 to GS576)
or the GS device used for individual communication
setting (GS590 to GS617) is validated.
GS
Description
device
Validity of
GS579 setting channel
number
For details of GS devices (GS570 to GS576) and GS
devices (GS590 to GS617), refer to the next page.
5. MODBUS(R)/RTU CONNECTION
5.5 MODBUS(R)/RTU Equipment Side Setting
Set value
Bit0: 0 Configure the Ch1 communication
settings between GS570 to
GS576.
1 Configure the Ch1 communication
settings between GS590 to
GS596.
Bit1: 0 Configure the Ch2 communication
settings between GS570 to
GS576.
1 Configure the Ch2 communication
settings between GS590 to
GS603.
Bit2: 0 Configure the Ch3 communication
settings between GS570 to
GS576.
1 Configure the Ch3 communication
settings between GS604 to
GS610
Bit3: 0 Configure the Ch4 communication
settings between GS570 to
GS576.
1 Configure the Ch4 communication
settings between GS611 to
GS617.
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