Schneider electric zelio compact plc modules schneider electric sr2d201fu this zelio logic module is a compact smart relay designed for simple control systems the unit has 20 io 12x discrete inputs8x relay outputs and a supply voltage of 100 to 240v ac the module is easy to install and program using either fbd or ladder and the zelio soft 2 programming software is intuitive to use zelio logic smart relays are operationally versatile with test simulation and monitoring modes along wit