I want to use do the H/W and S/W programming for implementing the CP CP communication between S7 300 and S7 400 as shown in attached document.

So which blocks are required and who ( S7 300 or S7 400) should be defined as master?

Is there any sample program for implementing ?

I am a newbie in CP communication so if a detailed procedure for implementing will be shared it will help me a lot.

Thanks in advance.