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Siemens Simatic S7-400 User Manual

Page 469

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CPUs for M7-400

11-41

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

Memory Areas for AT Cards

AT cards which are inserted in the expansion module ATM 478 can occupy the
following memory areas:

Range

M7 RMOS32

M7 RMOS32 with MS-DOS

M7 RMOS32

with

Without EMS

With EMS

with

MS-Windows

D 0000H to E 7FFFH

96 K

96 K

32 K

2)

32 K

2)

C 8000H to C BFFFH

16 K

16 K

16 K

16 K

C C000H bis C EFFFH

1)

12 K

12 K

12 K

12 K

C F000H to C FFFFH

4 K

4 K

4 K

4 K

1)

The area is only available if no memory card is present.

2)

Under M7 RMOS32 with MS Windows, or if the driver software under MS-DOS requires
expanded memory (EMS), the memory manager EMM386 occupies 64K in the area
D0000H to E7FFFH because it must be operated in EMS mode.

I/O Address Area

Addressing the ISA-compatible input/output components is done in the I/O area
under the addresses from 0100

H

to

03FFH. The addresses specified by the ISA

architecture are used here. In contrast to the original AT, the I/O addresses in the
CPUs are completely decoded so that the addresses above 03 FFH can be used
for addressing M7-400-specific hardware.

I/O Address Area for AT Adapter Modules

If you are using AT adapter modules, the following address areas are available for
addressing:

0200

H

to 03FF

H

Except for the area 3 E0H to 3 E3H and

Except for the areas which the interface submodules are occupying (see the
“Interface Submodules” chapter).

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