Siemens S7-300 - 4.2 Addressing the Channels

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01
5-7
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You will use either one rack or multiple racks, depending on your planned
application.
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• Compact, space-saving use of all your modules
• Centralized use of your modules
• Fewer signals to be processed
7LS:
If you opt for installation on a single rack, insert a dummy module to the right of the
CPU (order no.: 6ES7 370-0AA01-0AA0). This gives you the option of inserting a
second rack for your application in the future, simply by replacing the dummy
module with an interface module and without having to reinstall and rewire the first
rack.
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• More signals to be processed
• Insufficient slots available
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For arranging modules on a single
rack, the following rules apply:
• No more than eight modules (SM, FM, CP) may be installed to the right of the
CPU.
• All modules that you have installed on one rack may not exceed a total current
consumption of 1.2 A (312 IFM: 0.8 A) from the S7-300 backplane bus.