Power Supply - Siemens SCALANCE W774-1 Operating Instructions Manual

5.2

Power supply

Note
Galvanic isolation of the power supply unit
To ensure dielectric strength according to IEEE 802.3, the supplying 24 V power supply unit
must be galvanically isolated with a dielectric strength of 1500 VAC. The galvanic isolation
must also not be bridged by other devices connected to the same power supply unit.
SCALANCE W774/W734 RJ-45
For the power supply, there are two options with the SCALANCE W774/W734:
● Direct feed in via the four-pin socket (position
● Power over Ethernet via the RJ-45 Ethernet interface P2 (position
Ethernet interface P1 is not capable of PoE.
The four-pin connecting socket has the following pin assignment:
Pin
L1+
M1
M2
L2+
SCALANCE W774-1/W734-1
Operating Instructions, 09/2015, C79000-G8976-C325-06
①
)
②
Assignment
24 VDC
Ground
Ground
24 VDC
Connection
5.2 Power supply
). The other
25