Siemens S7-300 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...............................................................5-9
5.6 Selection and installation of cabinets ..............................................................5-12
5.7 Example: Selecting a Cabinet .........................................................................5-15
5.8 Electrical assembly, protective measures and grounding ...............................5-17
5.8.1 Grounding concept and overall structure ........................................................5-17
5.8.2 Installing the S7-300 with grounded reference potential
(except for CPU 312 IFM) ...............................................................................5-19
5.8.3 Isolated or non-isolated modules ....................................................................5-22
5.8.4 Grounding measures .......................................................................................5-25
5.8.5 Overview: Grounding.......................................................................................5-28
5.9 Selecting the Load Power Supply ...................................................................5-30
5.10 Planning Subnets ............................................................................................5-32
5.10.1 Extending and networking subnets .................................................................5-32
5.10.2 Basic principles of MPI and DP subnets .........................................................5-34
5.10.3 Interfaces.........................................................................................................5-37
5.10.4 Network Components ......................................................................................5-39
5.10.5 Cable length ....................................................................................................5-42
5.10.6 Sample networks .............................................................................................5-44
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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 312IFM - 318-2 DP
A5E00203919-01
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