Hi This is Santosh  I have a plant in which Siemens S7-200  and siemens simantic HMI are both interfaced and already programmed for the mixture operation.

Now I want to connect my PC/Laptop or arduino yun board to get the data from the PLC or HMI and publish to the cloud how can I do that

I know I can use PC Access and  STEP 7 Micro/WIN but how to use it with already programmed functioning system 

Please suggest

Thanks in adavance  

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Split from S7 200 and internet .

Hello,

nice interesting vision  as I don't work with YUN yet, only UNO and MEGA, probably I will be looking for some free 3-rd party SW to connect to S7-200 PLCs via my application on PC. If I'll have relevant data, YUN can connect to me via Ethernet as Client and make other work probably (connect to somwhere on internet-CLOUD). It depends how are S7-200 connected between each other. If You don't have experiences with creating your own applications, try some OPC system to collect data from PLCs and give via some interface to YUN. How send data to Cloud on YUN side is outside of my experience yet. Give your idea.