M7-400 Expansions
12-10 S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Division of Addresses in the M7-400-Specific I/O Address Area

The EXM 478 expansion module is operated on the ISA bus of the programmable

module. The I/O address area from C000H (to D2FFH) in the CPU 486-3,

CPU 488-3, or the FM 456 application module is reserved for this purpose. Each

expansion module occupies 256 bytes (100H) in this area. The division of the

address area is shown in Figure 12-6 using the FM 456-4 as an example.

Cn00
Co00
Cp00
Cq00
2) EXM 478
expansion module
Submodule receptacle
number 1
Reserved
00
40
80
All addresses are in hexadecimal notation.
Submodule receptacle
number 5
Submodule receptacle
number 4
Submodule receptacle
number 3
00
40
80
C0
FF
1) EXM 478
expansion module
e.g. FM 456-4
Cr00
3) EXM 478
expansion module
Submodule receptacle
number 0
Reserved
Submodule receptacle
number 6
00
40
80
Reserved
n .. q =Number of the slot of the
module in the mounting
rack
(in hexadecimal notation)
Example:
n = 6 FM 456-4 C600H
o = 7 1) EXM 478 C700H
p = 8 2) EXM 478 C800H
q = 9 3. EXM 478 C900H
BF
Figure 12-6 Base Addresses of the Expansion Modules and the Interface Submodules