324 Rockwell Automation Publication 1783-UM007G-EN-P - February 2017
Chapter 7 Configure Switch Features
Table 85 - PoE Fields
Field Description
Power over Ethernet (PoE) Port Configuration
Port Displays the port number.
Mode Displays the Power Management mode of the port:
• Auto—Enables the detection of powered devices and automatically allocates power to the PoE port if a device is connected. This setting
is selected by default. To limit the power that is used by this port, adjust the value Power Limit field.
• Static—Reserves power for this port even when no device is connected to make sure that power is provided upon device detection. You
can also choose Static mode to pre-allocate power to a specific port. The device allocates power to Static mode ports before it allocates
power to Auto mode ports.
• Off—PoE is disabled.
For more information, see
Power Management Modes on page 316.
Status Displays the status of the port:
• 0—The status is unknown.
• 1—PoE is enabled. Power is supplied to the port with no errors.
• 2—PoE is not enabled. Power is not supplied to the port.
• 3—PoE is enabled, but the device denied power to the port.
• 4—PoE is enabled, but a system fault occurred while power was supplied to the port.
• 5—PoE is enabled, but the port overdrew power.
Power Limit (W) Displays the maximum amount of power available to the port:
PoE ports: 4…15.4 W
PoE+ ports: 4…30 W
If the port is in Auto mode, you can enter a value. The default value is 15.4 W.
Power Used (W) Displays the amount of power currently in use by the port.
If the port is in Auto mode, the default value is 15.4 W.
If the port is in Static mode, you can enter a value to reserve power for the port.
Power Priority (Stratix 5410
switches)
Choose a power priority to assign to the port if there is a reduced power budget, such as a power supply failure. The system selectively
removes PoE power and shuts down lower priority ports to keep higher priority ports active. When multiple ports have the same priority
level, ports are shut down from highest port number to lowest port number. The system removes power from only the number of ports
necessary to maintain system operation without power cycling or other such disruptive results.
• Low (default)
• High
Switch/Expansion Module Statistics
Total Power Supported To limit the total PoE power budget, type an appropriate value that is based on the power source:
• A 48V power source supports a maximum of 65 W.
• A 54V power source supports a maximum of 130 W.
For Stratix 5410 switches use the following values:
• One power supply supports a maximum of 65 W.
• Two power supplies support a maximum of 185 W.
When you save this setting, it changes the total PoE power budget and resets the powered devices to meet the new budget.
IMPORTANT: A mismatch between the total power that is supported and the power supply can cause damage to the device. Take care not
to oversubscribe the power supply:
• If you intend to connect to a power supply that allows more wattage than configured, change the power supply and then specify the
total power supported.
• If you intend to connect to a power supply that allows less wattage than configured, change the total power that is supported to an
appropriate value. Then change the power supply.
Total Power Used Displays the amount of power in watts the device is using.
Remaining Power Available Displays the amount of unused power in watts available to the device.
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