The Model NT2140 of the BusWorks NT Ethernet I/O family is a discrete I/O module that provides six 120V or 240V AC optocoupler inputs for sensing the presence or absence of voltage plus two DC logic I/O channels to monitor/control TTL or 0-32V logic levels. A network interface supports Modbus TCP/IP, EtherNet/IP or Profinet protocols to communicate with programmable controllers or other networked devices. An OPC UA server, MQTT client and Restful API support Industrial Internet of Things (IIoT) applications. Sixteen I/O configurations are available as either NTE Ethernet I/O or NTX expansion I/O models. Analog I/O models feature up to 16 inputs or eight outputs for monitoring and controlling current or voltage signals. Discrete I/O models provide 16 tandem I/O channels or six mechanical relays to sense or switch on/off and high/low logic levels.