
Connecting up
6.4 Connecting the power supply
SCALANCE W786-x
42
Operating Instructions, 11/2014, A5E03678337-07
6.4
Connecting the power supply
Possible power supplies
You have the following options for the power supply of the SCALANCE W786:
Direct 24 VDC supply - direct voltage
A two-pin plug ships with the SCALANCE W786.
Power supply adapter 12 to 24 VDC - direct voltage
The power supply adapter Power Supply PS791-2DC is available as an accessory, order
number: 6GK5 791-2DC00-0AA0
Power supply adapter 100 to 240 VAC alternating voltage
The power supply adapter Power Supply PS791-2AC is available as an accessory, order
number: 6GK5 791-2AC00-0AA0
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 803.at
Type 2. With SCALANCE W786-2SFP, Power over the 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.