Siemens Simatic M7-400 Reference Manual page 468

CPUs for M7-400
11.5 I/O Addresses, Main Memory and Interrupt
Assignments
Introduction
This section gives you detailed information, in the form of a table, on the I/O
address space assignment, main memory and interrupt assignments of the CPUs.
Memory Assignment
The main memory is assigned as follows in the M7-400:
Table 11-8 Main Memory Assignment
1 MB to 15 MB
15 MB to 16 MB
E 8000H to F FFFFH
E 0000H to E 7FFFH
D 0000H to D FFFFH
C F000H to C FFFFH
C C000H to C EFFFH
C 8000H to C BFFFH
C 0000H to C 7FFFH
A 0000H to B FFFFH
0 0000H to 9 FFFFH
*)
If the interface submodule IF 964-DP is not plugged in the preferred slot (see Table 13-3
on page 13-4)
Keeping Memory Areas Free
The memory areas that are not always marked as "free" should be kept free when
using a memory manager.
SRAM Area
The size of the SRAM with battery backup is 64 Kbytes (net for data blocks
56 Kbytes). If the battery is removed and inserted again when there is no power
connected, the SRAM content will be lost. This is indicated by the BAF LED.
11-40
Address
S7-400, M7-400 Programmable Controllers Module Specifications
Content
User memory area
PROFIBUS DP*), otherwise free
BIOS
Free (32 K)
Free (64 K)
Free (4 K)
Memory card, otherwise free (12 K)
Free (16 K)
Shadow VGA BIOS (32 K)
VGA (128 K)
640 K system area
A5E00069467-07