Hello Mehdi;

Another way to find out the addressing area of different S7-400 CPUs is to look at some S7-400 catalogs of brochures, where you can browse the required information and compare the different models available.

I have prepared a screeshot based on the information in this document (from 2017):

https://www.automation.siemens.com/w2/efiles/pcs7/pdf/76/ST400_2017_en_Web.pdf

The address area is defined in kb of memory, where 1kb (of addresses) correspond to 1024 individual I/O address in the process image. A CPU 414-... can easily manage the 5000 I/Os you need in your project, with much to spare.

Hope this helps,

Daniel Chartier