Siemens SIMATIC NET SCALANCE W774-1 RJ-45 Operating Instructions Manual page 27

The SCALANCE W774/W734 RJ-45 devices support the standards IEEE 802.3at type 1
(IEEE 802.3af ) and IEEE 802.3.at type 2.
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
"Phantom power" only with SCALANCE W774 M12 EEC
The SCALANCE W774 M12 EEC device only supports the standard IEEE 802.3 at type 2.
With this device, the attachment to Ethernet is only possible using four-wire cables. For this
reason, no PSE (Power Sourcing Equipment) can be used that only supplies the power via
the free wire pairs.
Ethernet cables with M12 connectors for the SCALANCE W788-x M12 (Gigabit Ethernet,
eight-wire) cannot be used for the SCALANCE W774 M12 EEC.
Note
No power sourcing equipment (PSE)
The SCALANCE W774/W734 devices cannot be used as a PoE power supply for other
devices.
SCALANCE W774-1/W734-1
Operating Instructions, 09/2015, C79000-G8976-C325-06
Connection
5.2 Power supply
27