Siemens SCALANCE W778-1 Operating Instructions Manual page 44

Connection
6.4 Power supply
Position and pin assignment
①
②
The four-pin M12 socket has the following pin assignment:
Pin
1
2
3
4
Connecting/disconnecting the power supply
NOTICE
Turn off the power supply before you insert or remove the plug of the power supply.
1. Connect the plug and socket. Make sure that they lock in place correctly.
2. Tighten the knurled screw (torque 1 Nm).
Power over Ethernet
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.
44
M12 interfaces, A-coded
M12 interface P2, D-coded
The power can also be supplied via this interface (Power over Ethernet).
Signal
L1+
L2+
M
M
Operating Instructions, 07/2020, C79000-G8976-C450-06
Assignment
24 VDC
24 VDC
Ground
Ground
SCALANCE W778-1 /W738-1