YOKOGAWA SMARTDAC+ GM, Техническая информация

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TI04L55B01-01EN
3.3.7 Modbus Function
The Modbus function is used by the GM and external Modbus devices to perform communication
and data reading and writing.
The GM can perform the following operations.
Interface Protocol Function
Ethernet Modbus/TCP Modbus server
Modbus client (option, /MC)
RS-422/485 Modbus/RTU Modbus slave
Modbus master (option, /MC)

Modbus Server/Slave Function
The GM can operate as a Modbus server or slave.
Modbus client or master devices can perform the following operations on the GM.
• Read I/O channel and math channel (/MT option) data
• Read communication channel (/MC option) data
• Write data to communication channels
• Start and stop recording, write messages, and perform other operations
• Load the recording start/stop condition, message strings, and other types of data
• Limit the IP addresses that can connect to the GM Modbus server function.
Client devices can transmit commands to the GM to read data from and write data to the GM
internal registers. By writing data to the GM internal registers, you can control the GM (such as
start recording).
Modbus client device
GM Modbus server
Ethernet
Command
Input register
Hold register
Read
Write
Read
3XXXXX
4XXXXX
Write
Read
Read
GM internal register
Client device
l
Maximum Number of Client Connections When Operating as a Modbus Server
Type Maximum Number of Client Connections
GM10-1 4
GM10-2 4