Click series stackable micro brick PLCs include both Ethernet communications capabilities and analog I/O built in. Twelve units provide both discrete and analog I/O, including four discrete inputs, four discrete outputs, two or four analog inputs and two analog outputs. These Ethernet/analog PLC units are available with a variety of current and voltage (0-20 mA, 4-20 mA, 0-5 Vdc and 0-10 Vdc) inputs and outputs, with 24-Vdc or 120-Vac discrete inputs and dc or relay outputs. The units feature one built-in 10/100 Mbps Ethernet communications port for both programming and Modbus TCP networking, as well as RS-232 and RS-485 serial ports.