Siemens CPU 313C Hardware And Installation Manual page 22

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An S7 system can be used in many different ways, so we can only provide basic
rules for the electrical and mechanical installation in this section.
You must at least keep to these basic rules if you want your S7 system to operate
correctly.
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If you want to modify the configuration of an existing system at a later time,
proceed using the steps indicated above.
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If you want to install a signal module at a later time, consult the relevant
information for the respective module.
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Also note the description of your specific module in the 6,0$7,& 6 3/&V
manual and the 0RGXOH 'DWD 5HIHUHQFH 0DQXDO.
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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03