User Manual User guide

Rockwell Automation Publication 1783-UM004E-EN-P - June 2014 143
Manage the Switch via the Device Manager Web Interface Chapter 4
high-power devices on a port, set the mode to Auto and specify a maximum
power limit.
To configure PoE ports, from the Configure menu, choose Power Management.
IMPORTANT
When you make PoE configuration changes to a port, the port drops power.
Whether the port powers up again depends on the new configuration, the
state of the other PoE ports, and the state of the power budget.
For example, if port 1 is in Auto mode and the On state, and you configure it for
Static mode, the switch removes power from port 1, detects the powered
device, and repowers the port.
If port 1 is in Auto mode and the On state and you configure it with a maximum
wattage of 10 W, the switch removes power from the port and then redetects
the powered device. The switch repowers the port only if the powered device is
a Class 1, Class 2, or a Cisco-only powered device.
Table 15 - Power Management Fields
Field Description
Total Power Supported To limit the total PoE power budget, type an appropriate value 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.
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 supported and the power supply can cause damage to the switch. Take care not to
oversubscribe the power supply:
• If you intend to connect the switch to a power supply that allows more wattage than configured, first change the power supply and then
specify the total power supported.
• If you intend to connect the switch to a power supply that allows less wattage than configured, first change the total power supported
to an appropriate value and then change the power supply.
Total Power Used Displays the amount of power the module is currently using.
Total Power Available Displays the amount of unused power available to the module.
Interface Displays the port number.