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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x

A5E00105492-03

iii

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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

Siemens CPU 312C Hardware And Installation Guide

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