In this case, a ControlLogix uses the ENET bridge in slot 1 (0 based counting) for communicating
with the CIP client. The processor module itself is in slot 2. An additional ControlNet Bridge is in
slot 4 and is not used in this scenario.
The MindConnect sends a request to the ControlLogix on 192.168.0.22, slot 2.
This communication path (route parameters) is formed as follows:
It recognizes the CIP message is not for it and therefore, it removes its address part (1) from the
CIP message. The remaining CIP message is being forwarded to the processor module as
indicated by the remaining address information (2). The message contains a reduced
communication path with the slot number. The processor removes that information and start
interpreting the remaining message, as there is no further routing information in the packet.
The following Wireshark packet analysis shows the additional segment.
8.14 Case 2 – Accessing the Allen- Bradley PLC via integrated
Ethernet port
In this scenario, the CIP client sends some data into the CPU module using the integrated
Ethernet port. In a CPU module with integrated Ethernet port, the Ethernet port is in the same
slot as the CPU module.
The CIP client in the MindConnect sends a request package to the CPU module at 192.168.0.32
addressing the processor module in slot 0.
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