Connecting up
5.3 Connectors for the power supply of the SCALANCE W784-1xx / W74x-1
SCALANCE W-784-1xx / SCALANCE W-74x-1
78 Operating Instructions (Compact), Release 08/2007, A5E01174713-02
5.3 Connectors for the power supply of the SCALANCE W784-1xx /
W74x-1
Possible power supplies
The following power supplies are suitable for the SCALANCE W784-xx / W74x-1:
● 24 V DC or 48 V DC voltage
● Power over Ethernet (PoE)
If an eight-wire Ethernet cable is used, it is possible to supply power over the four wires
that are not used as data lines. As an alternative, the voltage can be modulated onto the
data lines ("phantom power")
If a Fast Connect Ethernet connector is used to allow cable assembly in the field and due
to its greater mechanical strength, you can only use four-wire cables. In this case, only
phantom power is possible.
Procedure for connecting the power supply
24 V / 48 V
L1 M1 M2 L2
Figure 5-1 Connector for the power supply of the SCALANCE W784-1xx / W74x-1. The screw
terminal is located as shown on the rear of the connector.
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