Distributed I/O modules are capable of transmitting analogue and digital signals over an Ethernet network.
This can be particularly useful in Security applications where PIRs, door sensors or other devices with relay or digital outputs need connecting to a central control room. The modules can be addressed via software running on a server or they can be used in pairs - what goes in one end comes out the other. This can be a very useful tool for distributing alarm signals over IP networks.