Address And Interrupt Assignments - Siemens SIMATIC FM 456-2 Installation, Hardware, And Startup

4.11

Address and Interrupt Assignments

This section contains detailed information in tabular form about I/O address area
mapping, memory and interrupt assignments in the FM 456-2 application function
module.
Memory Assignment
The main memory is assigned as follows in the FM 456-2:
Table 4-5 Main Memory Assignment
1 MB to 15 MB
E 8000H to F FFFFH
E 0000H to E 7FFFH
D 4000H to D FFFFH
D 0000H to D 3FFFH
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
page 4-10)
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 256 Kbytes (net for data blocks
244 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.
FM 456-2 Application Function Module Installation, Hardware, and Startup
C79000-G7076-C458-01
Address
*)
or to 16 MB
FM 456-2 Functions and Technical Data
Content
User memory area
BIOS
Free (32 K)
Free (48 K)
Reserved for CP 1401 (16 K)
Free (16 K)
Memory card, otherwise free (12 K)
Reserved (32 K)
Shadow VGA BIOS (32 K)
VGA (128 K)
640 K system area
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