Thursday, February 28, 2019

Dealing with PLC Equipment that use same I addressing

I work in a manufacturing environment which has a lot of equipment using PLC networking.

- We have an Electronics Manager who is in the midst of an effort to connect all of this equipment to a central server running a PLC control and monitoring interface.

- We have Cisco networking - 3750X Layer 3 switches at the core, and 2960 layer 2 switching at remote closets (where the PLC device would connect).

We have encountered a scenario where a vendor has installed their equipment on 2 lines, same equipment in each line, and both lines have the same IP addresses for each part.

- In this case, there is one primary interface for each line, and both use the same IP - let's say 10.1.1.1

- The goal is that our PLC server needs to be able to monitor both lines without conflict.

- The vendor advised us to use NAT translation for the ports where the two devices will be connected so that each one would appear as a different IP.

My question is... Can a Cisco 2960 switch perform this kind of NAT translation on a port to port basis?

Otherwise we are planing to put in two small Routers in front of each device to perform the NAT function for us.

I don't know that I'm in love with this plan, although I'm still somewhat new to the world of PLC networking, and maybe that's normal?

Was curious to see how someone else would approach it.



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