Ethernet Protocols (Modbus TCP/IP & Ethernet/IP) can be in the same network and in a ring topology without problems?
Please, refer to the attached drawing.
What are the equivalent Cisco Switches for the Stratix 5700 Switches?
Regards,
Jose
Switch – Ethernet Protocols (Modbus TCP/IP & Ethernet/IP) can be in the same network and in a ring topology without problems
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There are two cables connecting the switches, one for each VLAN. As a consequence of this we think there's no trunk needed, just port-based VLANs, isn't it? Within our company there's no connection between the two VLANs.
Here is your problem. By using two different links, you have created a loop in your network. The Cisco SG200 switches can't use per-VLAN Spanning Tree, so the Spanning Tree mechanism will disable one of those two links to prevent the loop from bringing down the entire network.
My advise: trunk the link between the two switches. You can use link aggregation (LAG) to increase the throughput if you want.
I would have said they weren't so much ambiguous as badly drawn.
As you say, there are very few bus-topology wired ethernet networks these days. The main issue (with both diagrams) is that it looks like two connections go into one socket (eg the bottoms of the router and switches). I'm sure even these days you can get switches with 10base5 or 10base2 or AUI connectors, but I've never seen one. In the 1990s we used to use hubs with 16 port of 10baseT and one 10base2 BNC socket, and occasionally we used the BNC socket, such as during a transition to 10baseT.
On the assumption it's just a drawing issue ...
If you're drawing a diagram which needs to emphasise cabling, such as a patch diagram or physical layout, you might draw it more clearly like this:
More usually we hide the layer 2 detail of switches and draw something like this, where a given broadcast domain is conflated just into a fat line:
Hope that's helpful.
Best Answer
At a high level, yes the protocols are compatible. As long as everyone follows the Ethernet standard, you can use multiple protocols. IP can carry TCP, MODBUS or others.
But your diagram suggests you may have other problems. As has been pointed out, spanning tree will create a loop-free path. In the event of a failure, it will take a few seconds to reconverge. That may or may not be acceptable to your system.
Also, you've created a single layer 2 domain. while that isn't bad in itself, it means there are more things to go wrong that may affect your whole system. Your IP addressing needs to be a single subnet for all your devices.
In my experience, some industrial devices (MODBUS) have trouble when there are lots of other devices on the network. They sometimes are sensitive to broadcast frames. If that's the case, you will need to add routers to create multiple subnets.