Siemens SIMATIC NET SCALANCE W786 Series Operating Instructions Manual page 57

Power over Ethernet (PoE)
With the SCALANCE W786-x RJ-45, power supply using Power over Ethernet (PoE) is also
possible. The devices support the standards 802.3at type 1 (IEEE 802.3af) and IEEE 802.3at type
2. With SCALANCE W786-2SFP, Power over Ethernet is not possible in any situation.
• Gigabit Ethernet
When you connect to gigabit Ethernet, the power supply is a phantom power supply over
data wires 1, 2, 3 and 6. This corresponds to alternative A according to IEEE 802.3af.
• Fast Ethernet
On an 8-wire Fast Ethernet cable, the power is supplied via the free data wires 4, 5, 7 and 8.
This corresponds to alternative B according to IEEE 802.3af.
Note
Disabling the PoE power supply
Before you pull a plug via which the device is supplied with power using PoE, disable the relevant
PoE power supply.
Note
No power sourcing equipment (PSE)
The W786 cannot be used as a PoE power supply for other devices.
Procedure for connecting the supplied connector for direct supply 24 VDC
The cable for direct power supply is connected to the SCALANCE W786 with the supplied
connector. The connector is safe against polarity reversal and can only be inserted in the left-
hand half of the housing. When connecting the wires, you should therefore make sure that the
connector is oriented as shown in the following figure:
Figure 6-3
SCALANCE W786-x
Operating Instructions, 12/2021, A5E03678337-14
M L1
DC 24 V
Position of the socket in the housing for the power supply
Connecting up
6.4 Connecting the power supply
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