Wiring the S7-400
4-36
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
4.20 Wiring the Front Connector, Spring-Type Terminals
Procedure
To wire the prepared front connector, follow the steps outlined below:
1. Are you using wire end ferrules?
If so: Strip the conductors over 10 mm. Press-fit the wire end ferrules onto the
conductors.
If not: Strip the conductors over 8 to 10 mm.
2. Use a screwdriver (0.5 x 3.5 mm DIN 5264) to release the spring contact of the
first terminal. Start at the bottom of the front connector.
You can release the individual spring contacts at three points: from the front,
from the side or from the back (see Figure 4-12 ).
3. Push the first wire into the released spring contact and withdraw the
screwdriver.
4. Repeat steps 3 and 4 for all other wires.
Releasing
a spring contact
from the front
Releasing
a spring contact
from the side
Releasing
a spring contact
from the back
Figure 4-12 Wiring a Front Connector with Spring-Type Terminals
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