Connecting The Power Supply - Siemens SIMATIC NET SCALANCE W786C Series Operating Instructions Manual

5.5

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 2-terminal terminal block 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, article
number: 6GK5791-2DC00-0AA0
Power supply adapter 100 to 240 VAC alternating voltage
The power supply adapter Power Supply PS791-2AC is available as an accessory, article
number: 6GK5791-2AC00-0AA0
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
802.3at type 2. With SCALANCE W786-2SFP, Power over 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.
SCALANCE W786C
Operating Instructions, 07/2019, A5E03692138-12
Connection
5.5 Connecting the power supply
49