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Table of Contents
Address
GT Designer3 converts the device numbers into
decimal format according to the address map of the
MODBUS 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
63 - 8
63. MODBUS(R)/RTU CONNECTION
63.5 MODBUS/RTU Equipment Side Setting
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 differ 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 settings
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
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.
Validity of
1 Configure the Ch2 communication settings
setting
between GS597 to GS603.
GS579
channel
Bit2: 0 Configure the Ch3 communication settings
number
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 Ch3 communication settings
between GS611 to GS617.
(a) When sharing communication settings between
multiple channel numbers
The table below shows the settings for the GS
device. The GS device can be changed even in the
middle of the operation.
GS
Description
device
GS570
Command selection
Function Code
"01"
GS571
Specification for the max.
number of coil read times
Function Code
"02"
GS572
Specification for the max.
number of input relay read
times
Set value
Set value
Bit0: 0 Using Function Code "0F"
1 Not using Function Code "0F"
Bit1: 0 Using Function Code "10"
1 Not using Function Code "10"
0: 2000
1 to 2000: Specify the maximum number.
Other than above: 2000
0: 2000
1 to 2000: Specify the maximum number.
Other than above: 2000

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