Hi  i need help about networking on S7 1200 ,have 2 CPU 1214C  every with their HMI panel KP 300 MONO.  We can say that they are independent system. Only  what i need more  is sending one Byte from CPU 1 on CPU 2 .. Which communication is best to use  and if HMI connection  and local/partner connection must be on same subnets  or  not  

thanks

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Split from about SIEMENS PLC.

hi zjurdik,

You can comunicate over S7 connection with the blocks PUT/GET. This FAQs may help you:

How you configure a connection in the TIA Portal?

How do you program the "GET" and "PUT" instructions in the user program of the SIMATIC S7-1200 CPU in order to transfer more than 160 bytes of data?

You can also communicate over I-Device. See this application sample:

Configuration and application of PROFINET I-Device function

hope this helps,

regards,

zjurdik

hi  i still programed TSEND_C   and  TRCV_C   instructions   but  still didnt test it  . I dont know  if  i can use that type of  communication together  with 2 HMI  connections  for  Panels

 hi,

yes, it can be done together with the HMI-communications.

Have a look in the technical data of your CPU. There you can see the maximum number of connections, HMI-connections, OUC, S7-connection etc.

hope this helps,

regards,

https://support.industry.siemens.com/cs/attachments/73505596/GettingStarted_en-US.pdf?download=true