In network 2 of FC1, I do not understand meaning of 286.0 ( P#P  286.0 INT 1) . Who can help me.

Link to file for study follow:

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Thank you.

As seen in this post: https://support.industry.siemens.com/tf/WW/en/posts/indirect-addressing/76591?page=0&pageSize=10

It loads the Peripheral adress of 286 as an INT

Generally known as PIW286

PIW286 instead of the (P#P 286.0 INT) would also work to read out the analog value at that adress