This product is part of the Modicon M171/M172 range, an offer of connection accessories for HVAC solutions.This screw terminal block offers 42 I/Os with base controller.It is furnished with removable terminal block screw connector for electrical connection.It is compatible with logic controller M172 performance.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.