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The following pictures demonstrate how to send ModbusRTU requests via EthernetIP using CIP messages.
The screenshot only demonstrate how to setup the CIP message parameter correctly.
Finaly it depends on the used EthernetIP scanner (PLC etc.) how to formulate and send CIP requests.
Example: write multiple register
Example CIP to function code 16
Parameter
Send to
Service
Class
Request Data
Instance
Attribute,Member
80409D_MSW_GFX4-ETH1_04-2013_ENG
SENDIG CIP MESSAGES
Value
192.168.30.30
0x50
0x44
00 00
02 00
aa bb cc dd ee
1-n
0
Description
GFX4-ETH1 address
CIP service for Modbus FC 16
The Modbus Object number
Register Address
Quantity of registers
Data to write
Modbus RTU Slave address
9
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