Dear friends,

Currently I am working on a cute project which involves connecting 1 PC Station "TIA Portal WinCC RT" with three 315-2 PN/DP in a simple LAN network, that was the good news.

The bad news is that we have one CPU which is 150m in distance with the PC station.

And as far as I know the limit distance should be 50m.

What do you recommend in this case to overcome distance problem.

Also do you recommend "STAR" or "LINE" configuration for this network.

Thank you in-advance.

Tomy

Would you please provide some details on your recommendation.

Warm regards,

Tomy

Any idea my friends.

Thank you in-advance.

Hello Tomy;

When you say "LAN", you mean an Ethernet network, right?

Where does it say that the LAN limit is 50 m? To my knowledge, the distance limit on a LAN is 100 m over copper wire, CAT5 cable or higher. This is a very basic information on Ethernet requirements that you can research easily; for example;

https://en.wikipedia.org/wiki/Network_topology

If you need more distance, a switch is required as a repeater. A simple 4-port switch (unmanaged) is easy to find and enough for a simple extension.

Ethernet supports bus (line), star or ring topologies (with at least one managed switch) intrinsically, which one you choose will depend on the requirements of your project. Or you might decide to try Fiber Optic connections, as suggested earlier. But for 150 m I believe that this would be overkill, the price of a small unmanaged switch is very low compared to F.O/copper switches.

- 4-port unmanaged switch, copper:

https://www.digikey.ca/product-detail/en/phoenix-contact/2891001/277-2437-ND/2526026?utm_adgroup=&mkwid=sciiwsHWa&pcrid=313220472407&pkw=&pmt=&pdv=c&productid=2526026&slid=&gclid=CjwKCAiA8OjjBRB4EiwAMZe6ywkJ-AzDieOlyNkA8GLgrqmplYyQ7fj2n4j15rqyM9JscOYQPGoFAhoCGYQQAvD_BwE

- 5-port unmanaged switch, copper + F.O.:

https://www.digikey.ca/product-detail/en/phoenix-contact/2891029/277-14752-ND/2743794

If you need more support, please provide more information, schematics or designs for the planned network.

Hope this helps,

Daniel Chartier

Dear friend

My costumer found an "un-managed switch" SCALANCE X108 in the warehouse of the factory.

I am wondering now if the SCALANCE X108 would do the "unmanaged  switch" job (the job of connecting the PC station and the 3 S7-300 CPUs with the distance of 150m)?

Thank you again in-advance

Tomy