Siemens CPU 313C Hardware And Installation Manual page 98

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The front connectors are completely wired.
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2.
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Push in the unlocking mechanism on top
of the module.
Keeping the locking mechanism
pressed, insert the front connector into
the module.
Provided the front connector is seated
correctly in the module, the unlocking
mechanism automatically returns to
initial position when you release it.
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When you insert the front connector into the module, an encoding mechanism
engages in the front connector, thus ensuring that the connector can only be
inserted in modules of the same type.
Close the front panel.
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The work step numbers are shown in the figure above
 Keep unlocking mechanism pressed.
 Insert front connector.
 Then close the front door.
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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Tighten the mounting screw in the
center of the connector.
This pulls the front connector
completely into contact with the
module.
Close the front panel.
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 Tighten mounting screw.
 You can now close the front panel
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A5E00105492-03