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Siemens SIMATIC TOP connect Manual page 27

System cabling
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3. Place the front connector in the pre-wiring position.
To do this, slide the front connector into the signal module until it clicks into place. In this
position, the front connector still protrudes from the module.
Advantage of the pre-wiring position: Convenient wiring.
The front connector has no contact to the module in the wiring position.
Figure 4-2
Note
In this position, the front connector module is still protruding from the I/O module (see figure
above). The front connector module and I/O module are not yet electrically connected.
The pre-wiring position makes it easy to wire the front connector module.
4. If required, connect the cables for the I/O module supply voltage to the front connector
module.
System cabling for S7-300
Manual, 09/2018, 70327045899
Front connector module in the pre-wiring position (example)
Connecting
4.3 Connecting components
27
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S7-300

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