Note
Solar or battery power is not recommended for PoE PSE operation as there are additional
power loses caused by the PoE circuitry.
What is the maximum Voltage PoE PSE can source?
Maximum Voltage is normally 48 VDC; up to 25 Watts.
Can you do redundant power with PoE?
Yes, as PoE becomes more popular many network appliance (switch) providers are
supplying innovative switches and other hardware to create redundantly powered
networks. Typically, many switch suppliers offer switches that allow multiple power
inputs. Check your local switch supplier as to available configurations. Also, the Gateway
will work with a local power supply connected to the power input terminals of the
Gateway and as a PD with power coming over the Ethernet at the same time. If both
sources are present, the Gateway selects the local power supply first. If the local power
fails, the Gateway automatically switches to Ethernet power. When the local power is
restored, the Gateway automatically returns to local power.
How do I know if my 1420 Gateway has IEEE PoE capability?
The simplest way to check for IEEE PoE capability is to open the upper door on the 1420
Gateway and the see how the computer board is mounted. In the newer hardware, the
board is mounted horizontally. The old hardware the computer board was mounted
vertically.
Reference Manual Installation
00809-0200-4420 September 2020
Emerson.com/Rosemount 31
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