MQTT PoE I/O Module with 8 Digital Inputs, 8 Digital Outputs and 2-port Ethernet Switch. WISE-7555M provides 8 Dry/wet contact digital input channels and 8 source-type digital output channels. It features optical isolation for 2500 VDC of transient overvoltage protection but doesn’t provide channel-to-channel isolation. It can safely be used in applications where hazardous voltages are present. WISE-7555M follows IEEE 802.3af- compliant Power ove..