Siemens CPU 313C Hardware And Installation Manual page 3

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5.1 Summary of the Content ...................................................................................5-1
5.2 Basic Principles of Planning ..............................................................................5-2
5.3 Component Dimensions ....................................................................................5-4
5.4 Arranging Modules on a Single Rack ................................................................5-7
5.5 Arranging Modules on Multiple Racks...............................................................5-8
5.6 Selection and installation of cabinets ..............................................................5-11
5.7 Example: Selecting a Cabinet .........................................................................5-14
5.8 Electrical Assembly, Protective Measures, and Grounding ............................5-16
5.8.1 Grounding concept and overall structure ........................................................5-16
5.8.2 Installing an S7-300 with Grounded Reference Potential ...............................5-18
5.8.3 Configuring an S7-300 with Ungrounded Reference Potential
(Not CPU 31xC)...............................................................................................5-19
5.8.4 Isolated or Non-Isolated Modules?..................................................................5-20
5.8.5 Grounding Measures .......................................................................................5-23
5.8.6 Overview: Grounding.......................................................................................5-26
5.9 Selecting the Load Power Supply ...................................................................5-28
5.10 Planning Subnets ............................................................................................5-30
5.10.1 Extending and Networking Subnets ................................................................5-30
5.10.2 Basic Principles of MPI, DP and PtP Subnets ................................................5-32
5.10.3 Interfaces.........................................................................................................5-35
5.10.4 Network Components ......................................................................................5-38
5.10.5 Cable Length ...................................................................................................5-41
5.10.6 Sample Networks ............................................................................................5-43
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6.1 Installing an S7-300...........................................................................................6-1
6.2 Installing the rail.................................................................................................6-3
6.3 Installing Modules on the Rail ...........................................................................6-7
6.4 Label the modules .............................................................................................6-9
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
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