Connecting up
5.8 Cabling for power supply and Ethernet
SCALANCE W788-xPRO/RR / W74x-1PRO/RR
42 Operating Instructions, 07/2014, A5E02280448-08
Cabling for power supply and Ethernet
Suitable cables
The following cables are available for connecting a SCALANCE W788- xPRO/RR or
SCALANCE W74x-1PRO/RR to the power supply and Ethernet:
● IE hybrid cable 2 x 2 + 4 x 0.34 (order no. 6XV1870- 2J)
The two data wire pairs are separately shielded. This cable is particularly suitable for
assembly with the IE IP 67 hybrid connector.
● IE FC TP standard cable 4 x 2 GP (order no. 6XV1870-2E)
In these cable types, two wires are twisted. All four pairs of wires are inside a common
shield.
● 2 x 2 IE cable, the optional power supply (18 - 48 V DC) is over M12 connectors.
Cable selection and interference exposure
A decisive factor in the selection of a cable type is the electromagnetic interference to which
the current lines between the power supply and the FC RJ-45 modular outlet are subjected.
Due to the separate shielding of the data wires, such interference has less effect on the data
transmission on a hybrid cable than on TP standard cable or TP flexible cable.
Figure 5-3 Wiring a SCALANCE W788-xPRO/RR with electromagnetic interference between the
power supply and modular outlet
A power supply
B FC RJ-45 modular outlet with power insert
C SCALANCE W788-xPRO/RR
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