852 Series Ethernet switches offer an alarm contact, enabled via dip switch, to signal an error condition on the switch.
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, for example), power supply disruption/disconnect, or power
supply voltage out of specified range. Wago Corp.www.wago.us800.DIN.RAIL
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