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The Gateway functionality follows the specification for "Integration of Modbus Devices into the CIPArchitecture" which
can be found in the "THE CIP NETWORKS LIBRARY Volume 7".
Follwing this specification the GFX4-ETH1 Firmware contains the "CIP Modbus Object" (Class Code 44hex).
This object is responsible for receiving acyclic Class services from the EthernetIP protocol and convert them into
ModbusRTU requests and returning the correspong confirmation.
PLC
EthernetIP Master/Scanner
4
Mapping Function EthernetIP to ModbusRTU
EthernetIP: Object Service 4B, 4C
CIP Object 44hex
Modbus: FC3, 16 etc. Req./Cnf
GFX4 - EIP
RS485
Figure 2: GFX4-ETH1 overview
Ethernet TCP/IP
ModbusRTU Slave
GFX4
80409D_MSW_GFX4-ETH1_04-2013_ENG
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