The Modicon M171 PLC controller in optimized version is designed for simple and compact applications in the field of HVAC machines and pump automation. Thanks to its small design, it can be used in a space-saving manner. The integrated display and buttons allow control parameters to be set directly on the device. The controller has a total of 22 integrated I/Os, including 6 digital and 5 configurable (U/I/T) analog inputs, 6 digital and 5 configurable (U/I/PWM/PPM) analog outputs. The power supply is via 24 VDC or 12 VAC to 24 VAC. The digital outputs are designed as relays (2A / 230VAC). One output is designed as an open collector. The connections are made using removable screw terminal blocks (not included in delivery). Mounted on 35mm top hat rail. Is programmed with the free EcoStruxure Machine Expert - HVAC software. Certified to CE, cURus (UL recognized), CSA, EAC, RCM, RoHS China.