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Multiple Networks on a S7-1200

2/3/2025 9:17 PM	Rate (0)
erob4 Joined: 12/11/2024 Last visit: 4/2/2025 Posts: 2 Rating: (0)	I am hoping to get some input on a design, specifically around the networking. I am working on a design that will have multiple 'systems' which consist of a S7-1200 CPU (currently targeting the S7-1214C) and some ET200SP distributed I/O. There will also be a 'plant controller' (industrial PC) that will communicate with the S7-1200 CPUs over PROFINET. I'd like the 'local' network of the CPU and distributed I/O to be on separate networks than the 'plant network' which consists of the plant controller and the system CPUs. Is this dual network approach achievable with the S7-1200 family (S701214C ideally) and any specific networking modules?

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2/4/2025 7:35 AM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 7/31/2025 Posts: 9027 Rating: (1199)	Hello, Please give some more information about the communication between PC and S7-1200? Are you sure it is Profinet communication? Or is it TCP communication? Best regards, Wizard

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2/4/2025 3:30 PM	Rate (0)
erob4 Joined: 12/11/2024 Last visit: 4/2/2025 Posts: 2 Rating: (0)	We are planning on MQTT over TCP for the plant to system communication, but haven't implemented this yet.

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2/11/2025 10:27 AM	Rate (0)
Murof Platinum Member Joined: 8/3/2009 Last visit: 9/12/2025 Posts: 16409 Rating: (1935)	Hello erob4 Does the PC have multible networkcards? (one directly in the subnet of the local network of the PLCs?) or do you use CPs on S71200 or network routers? basically if the tcpip communication works also he MQTT should work. Here some basic information: https://support.industry.siemens.com/cs/ww/en/view/109748872 Bye Murof
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