Memory areas of PLC

hello everybody

I want to get deep understand of memory areas in PLC. I am talking about

new series of S7 PLCs, Not old versions of S7.

every where it is written that we have 3 memory area.

1.Load memory

2.system memory

3.work memory

I want to know DBs where are stored in?

and if I have a MMC on my CPU module can i have desirable number of retentive variables?

Respectfully i need short and clear answer.

looking forward to your kind worth responses.

best regards

Hidian

Hello!

Look manuals below:

SIMATIC S7-1200 Easy Book

Look - 4.4 Memory areas, addressing and data types

SIMATIC S7-1500, S7-1500R/H, SIMATIC Drive Controller, ET 200SP, ET 200pro Structure and Use of the CPU Memory

Look - Memory areas and retentive memory 2

And little bit yet:

SIMATIC S7-1500, ET 200MP Automation system

Programming Guideline for S7-1200/S7-1500

For example - "Memory areas and retentive memory S7-1500"

DB stored as in load and work memory (but in different views...)