Can we lay ProfiBus communication cable along with 415v cable tray
No, because the magnetic field from the 415v cables will interfere with the Profibus signal thereby corrupting the signal on the Profibus cable. you can do it if the 3 phase of 415 volts is balanced. Electrical power in the cable will generate magnetism and balanced 3 phases of 415 volts will cancel each other. Preferably data cable should be completely separate from the power line. Big current drawing conductor