Hello all

I am working on a project which require five S7 1200 PLCs as modbus servers and one S7 1200/1500 PLC as Client. Each server PLC independently controls local equipment  and connected to four HMIs KTP700. Experts please take a look at the attached network diagram and advise if this network connection is correct and workable

Dear Sir

Thank you for the reply. OK I got it. It is better to use the Put/Get function to grab data from the server PLCs. The main PLC has to talk with a PC Software which works on modbus. Can I use Modbus for that purpose?  Is the proposed network wiring using Ethernet switches is workable?