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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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The figure below shows the arrangement of eight signal modules in an S7-300
assembly.
SF
BUSF
DC5V
FRCE
RUN
STOP
SIEMENS
CPU
PS
SM1
SM2
SM3
SM4
SM5
SM6
SM7
SM8
Figure 5-4 Rack with eight signal modules
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Arranging Modules on Multiple Racks
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With CPU 312 and CPU 312C, only a single-row configuration on a rack is
possible.
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If you are planning a structure distributed between multiple racks then you will
need interface modules (IM). Interface modules route the backplane bus of an
S7-300 to the next rack.
The CPU is always located on rack 0.
Table 5-4 Interface modules - Overview
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Send IM in rack 0 IM 360
Order No.: 6ES7 360-3AA01-0AA0
IM 365
Order No.: 6ES7 365-0AB00-0AA0
Receive IM in rack 1 to 3 IM 361
Order No.: 6ES7 361-3CA01-0AA0
IM 365 (hardwired to send IM 365)
Maximum number of
expansion modules
3 1
Length of the connecting
cables
1 m (6ES7 368-3BB01-0AA0)
2.5 m (6ES7 368-3BC51-0AA0)
5 m (6ES7 368-3BF01-0AA0)
10 m (6ES7 368-3CB01-0AA0)
1 m (hardwired)
Remarks - Rack 1 can only receive signal
modules; total current load is limited
to 1.2 A, whereby the maximum for
rack 1 is 0.8 A
These restrictions do not apply to
operation with interface modules
IM 360/IM 361
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