This feature is standard on both managed and unmanaged switches
(non-ECO versions). The power input connector on the switch has two
dedicated alarm circuit connections that can be wired to any warning
device, such as a PLC or pilot light. Error conditions that can be
monitored include port link failure (cable disconnect, network
disruption, etc.), power supply disruption/disconnect, or power supply
voltage out of specified range (9…48V).
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