This product is part of the Modicon M171/M172 range, an offer I/O modules for HVAC solutions.This additional I/O module offers 4 discrete inputs with sink or source (positive/negative) discrete input logic.It is a module with discrete input voltage of 24V AC/DC and analogue output voltage ranges from 0V to 10V.This module offers SPDT relay output with independent common and 3 SPST relay output with same common discrete output.The main application of this module is HVAC and pumping solution.Modicon M171/M172 benefits maximize profitability and energy efficiency by using scalable automation control with the Modicon M171/M172.Modicon M171/M172 logic controllers and intuitive software EcoStruxure Machine Expert – HVAC are designed for maximizing profitability and energy efficiency.