Can we use any DB nos of SIMATIC to be mapped with MODBUS REGISTERS

Dear All
I am very new to MODBUS.

I just want to know that if I put some setting data in DB1, DB6 and DB8 of SIMATIC DATA BLOCKS, can we map these data blocks to MODBUS REGISTERS?


we need to keep the setting data only in DB11, DB12, DB13 (HOLDING REGISTERS) or in DB 16 and DB 17(INPUT REGISTERS) so that we can map to MODBUS REGISTERS acccordingly.
Rajib Das.