Power Connection; Figure 2.8: Pin Assignment Of The Power Connector - Advantech EKI-7758F User Manual

8g ports industrial managed redundant gigabit ethernet switch, 4 gigabit copper and 4 gigabit sfp
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2.6 Power Connection

The EKI-7758F supports dual +12 ~ 48 V
power inputs and power-fail relay output.
DC

Figure 2.8: Pin Assignment of the Power Connector

You can connect an alarm indicator, buzzer or other signaling equipment through the
relay output. The relay opens if power input 1, 2 fails or port link down/break ("Open"
means if you connect relay output with an LED, the light would be off).
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