Using Modbus/Tcp To Enable The Gx/Gp To Read Data From And Write Data To Other Devices (Modbus Client Function); Setting Basic Network Communication Conditions; Configuring The Modbus Client Function - YOKOGAWA GX20 User Manual

4.2 Using Modbus/TCP to Enable the GX/GP to
Read Data from and Write Data to Other Devices
(Modbus client function)
4.2.1 Setting Basic Network Communication Conditions
Description
4.2.2

Configuring the Modbus Client Function

Description
IM 04L51B01-01EN
The Modbus function is used by the GX/GP and external Modbus devices to perform
communication and data reading and writing.
The GX/GP can operate as a Modbus client. The maximum number of connectable servers
is 16 for the GX20-1/GP20-1/GX10/GP10 and 32 for the GX20-2/GP20-2.
The GX/GP can connect to another device (Modbus server) via Modbus/TCP and read from
and write to the device's internal registers. Read data can be handled using communication
channels. Data that can be written are I/O channel data, math channel data, and
communication channel data.
Modbus server
Ethernet
• Obtain the IP address automatically
• Set the IP address manually (when automatic IP address assignment is set
to Off)
For details on the settings, see page 1-180 in section 1.21.1, "Setting Basic Communication
Conditions".
• Enable the Modbus client function
• Set the communication interval
• Set the recovery action
• Set the keep connection function
For details on the settings, see "Configuring Basic settings" page 1-189 in section 1.21.6,
"Configuring the Modbus Client Function (Option, Function available when /MC is
specified)".
Server device internal register
Input register
3XXXXX
GX/GP
Hold register
4XXXXX
Modbus client
GX/GP
Command
Read
Read
Read
Read
Write
Write
4-3
1
2
3
4
5
App
Index