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Connecting two LAN network segments - Printable Version

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Connecting two LAN network segments - Lingyue - September-5th-2019

Hello Armin,

Now we want to use netPI to connect MES system and the machine tool which on field at the same time. Both network are standard TCP/IP ethernet protocol, they are different network segment, but on our netPI just has one ethernet interface. We have considered the way to use WiFi. Do you have any other suggestions for this question? 

Looking forward your reply.


RE: PM - Armin@netPI - September-5th-2019

Which version of netPI do you use? I suppose you are using netPI CORE 3 (NIOT-E-NPI3-EN) with 1 single Ethernet port?

With option netPI RTE 3 (NIOT-E-NPI3-51-EN-RE) you have two additional ethernet ports. These two ethernet ports are usually used for Real-Time Ethernet communication in network such as PROIFINET, EtherNet/IP or EtherCAT. This feature is provided by the additional netX controller chip that is part of netPI RTE 3. This netX chip can also support standard TCP/IP.

But you need to program this Chip extra using a special Docker image https://hub.docker.com/r/hilschernetpi/netpi-netx-ethernet-lan. This Docker image transfers the netX chip into a standard LAN chip. But netX chip is slower for TCP/IP traffic than normal LAN controller chip. So please the README of the Docker image.

With WLAN I feel it is not always stable for long term communications. I would prefer cable based communications in all cases. The Wifi connection is more for service and maintenance for a short period of time.


RE: Connecting two LAN network segments - Armin@netPI - September-9th-2019

Hello Lingyue,

I have an alternative for you. I checked using a device like this RTL8153.

Once I plugged it in my netPI (version at least) I had an eth1 instantly. Maybe there are also mor robust USB to Ethernet converter available on the market.

Maybe there is also a device available from any other supplier like Beckhoff and device CU8880 which is more industrial like.