App-2
IM MW100-01E
Appendix 2 Setting Data Communication That Uses
Modbus Protocol
This section descries the procedure for data transmission and reception based on a
configuration in which two MW100s are connected for Modbus communications (Modbus/
TCP) over an Ethernet. Note that the MATH function (/M1 option) is required to use the
Modbus client function.
Setup Procedure
The following shows the procedures for entering settings, from connecting to the Ethernet
to applying the data acquired via Modbus communications. For detailed instructions and
specifications on each function, see the MW100 Data Acquisition Unit user’s manual.
Enter Ethernet settings
Enter Client Settings, 1
Enter Client Settings, 2
Enter Client Settings, 3
Enter Server Settings
Enter Ethernet Communication Settings
See section 3.2
See IM MW100-76E for how to check the connection.
Enter the destination server.
See section 3.2, “Modbus Client Settings, 2.”
Enter register settings.
See section 3.2, “Modbus Client Settings, 3.”
See section 5.2 for details on registers.
Enable the client function.
See section 3.2, “Modbus Client Settings, 1.”
Enter MATH channel
settings
Enter Server Settings
See section 3.13, “Entering Server Settings.”
Server
Settings
Client
Settings
Connect to Ethernet
Connect the MW100s to the Ethernet.
See section 2.6
Apply data acquired via Modbus communications.
See section 3.6 for the settings.
See section 1.13 regarding communication input channels.
Example System
In this example, the system comprises one client MW100 and one server MW100
connected via Ethernet.
MW100 (Server)
Direction of data
READ
WRITE
MW100 (Client)
IP: 192.168.1.101
Modbus service port: 502
IP: 192.168.1.100
Ethernet
MW100
MW100
The MW100 set up as the client in the above system diagram is referred to as the
MW100 client. Likewise, the MW100 set up as the server is referred to as the MW100
server.
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