A question to Connect PLC S7-300 with ET200

PLC supplied from power and ET 200 supplied from difficult.
Do you anything that danger for system?

Wether the ET200 (ET200M or ET200S ?) is connected to the S7-300 CPU via Profibus or Profinet, it does not matter if the supply voltage is shared with the CPU or not. The ET200M/S can sit next to the CPU and share the same power supply, or sit in another panel with its own power supply.
What is very important is that there is a good equipotential ground connection between all panels.

Thanks for share,
I used ET200M. Connect to PLC S7 300 via Profibus.
Power supply is 3 phase. This case, used Phase A and used phase N is supply for PLC. Used phase B and used phase N is supply for ET200M.
I don't know action communication PLC and ET?

Just be sure that everything shares the same good ground.
If distributed over several panels, there must be a good equipotential ground between the panels.