Hi,

  I also have some doubt, kindly refer attached picture;

   Picture 1- HWD 400H:  It shows hardware configuration of 400H with two Profinet IO systems with different subnets. It complies without error.

    Picture 2- Netpro 400H:  Same project in Netpro,; compiles with error (Picture 3- Error Massage).

    If both Profinet IO system-1 & Profinet IO system -2 are connected to the same subnet then only it compiles in Netpro. (Picture-4).

   If have to set fault tolerant connection between PC station & 400H with Profinet IO System; the hardware configuration shown in Picture-5; But is shows the same error message shown in Picture-5.

    & With same subnet it does not shown error. (Picture- 6)

    That means, Can fault tolerant connection between PC station & 400H not possible with different subnet?

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Split from Use PN port of 5H controller for communicating with both IO controlle.