NEED- Programmable Relay without display 16 input (13 digital inputs and 3 analog-digital inputs) for graphic language LAD or text language STL LED signaling the status of the Relay and input / output NEED system-D - programmable relay Cable for programming and diagnostics for connection to PC computer: - RS232 - NEED-PC-15B - USB - NEED-PC-15C NEED-M-4KB: external memory card Free PC NEED software for editing, compiling, programming of the relay and the external memory card (programming in graphic language LAD and text language STL)