Siemens SIMATIC S7-400 Manual page 42

Special functions of a CPU 41x
3.2 Multicomputing
Example
The following figure shows an automation system operating in multicomputing mode. Each
CPU can access the modules assigned to it (FM, CP, SM).
Central rack
Expansion rack
Figure 3-1
3-4
C C C C
P P P P
P
U U U U
S
1 3 4 2
I CP, FM,
I/O
M I/O
I CP, FM,
I/O
M I/O
I CP, FM,
I/O
M I/O
I CP, FM,
I/O
M I/O
Example of multicomputing
I I I
M M M
1 2 3
I I
I/O
M M
I I
I/O
M M
I I
I/O
M M
I I
I/O
M M
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
CP, FM, I
I/O M
CP, FM, I
I/O M
CP, FM, I
I/O M
CP, FM, I
I/O M