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 thisposition, 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 Front connector module in the pre-wiring position (example)NoteIn this position, the front connector module is still protruding from the I/O module (see figureabove). 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 connectormodule.Connecting4.3 Connecting componentsSystem cabling for S7-300Manual, 09/2018, 70327045899 27
