Siemens SCALANCE W788C-2, Operating Instructions Manual

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Connection
5.3 Power supply and Ethernet
SCALANCE W788C-2
Operating Instructions, 07/2019, A5E03692120-14
35
5.3 Power supply and Ethernet
Connecting the power supply
Models RJ-45 / degree of protection IP30
The four-pin connecting socket has the following pin assignment:
Pin Signal Description
1 L1+ 24 VDC
2 M1 Ground
3 M2 Ground
4 L2+ 24 VDC
The M12 socket for the power supply has the following pin assignment:
Pin Signal Description
1 L1 24 VDC
- - -
3 M1 Ground
- - -
Power over Ethernet (PoE)
With the SCALANCE W7x8, 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.
● 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 W7x8 cannot be used as a PoE power supply for other devices.