I'm looking for a complete discription a bout earthing system in control panels(PLC Panels)

which equipment must be connected to IE and which to PE?

are PE and IE the same ?or they are isolated with each other?

I appritiate any reply

thanks in advance

I am afraid to say that I am fully agreed with Juergen,Grounding is the most important part of a plant that intended to save lives and properties in case of a fault occurring. Design and implementing such a system are lucrative businesses and require great knowledge of national and international norms, great experience and very special devices to test the whole designed and implemented concept. We can not provide you all data you require in form of checklists as you need to consult with an Expert in the field for reliable comments. What we can share here would be some grounding concerns discussed in "Hardware Installation" manuals provided for S7 controllers.