Siemens Simatic S7-400 User Manual Page 475

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M7-400 Expansions
12-5
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Permissible Combinations
You can see from the table below which expansions can be connected to the
programmable M7-400 modules.
Table 12-1 Expansion Possibilities of the CPU 486-3, CPU 488-3, or FM 456
Programmable M7-400 Module
Slot Slot Slot
Slot n in the Case of Single-Width Modules n + 1 n + 2 n + 3
Slot n and n+1
in the Case of Double-Width Modules
n + 2 n + 3 n + 4
EXM 478
EXM 478 EXM 478
EXM 478 EXM 478 EXM 478
EXM 478 EXM 478 ATM 478
EXM 478 ATM 478 ATM 478
EXM 478 ATM 478
CPU 486 3 CPU 488 3 FM 456 4
ATM 478
CPU 486-3, CPU 488-3, FM 456-4
ATM 478 ATM 478
ATM 478 ATM 478 ATM 478
MSM 478
EXM 478 MSM 478
EXM 478 EXM 478 MSM 478
EXM 478 MSM 478 ATM 478
MSM 478 ATM 478 ATM 478
MSM 478 ATM 478
Rules for the Combinations
The following rules apply for expansions from left to right after a CPU or application
module (slots n + 1, n + 2, n + 3 or n + 2, n + 3, n + 4):
1. Up to 3 EXM 478 expansion modules
2. Max. 1 MSM 478 mass storage module
(that is, always after the CPU 486-3, CPU 488-3, FM 456, or EXM 478)
3. Up to 3 ATM 478 AT adapter modules
(that is, always after the CPU 486-3, CPU 488-3, FM 456, EXM 478, or
MSM 478)
In total, a CPU or application module can be expanded with up to three modules.
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