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 controller has a total of 22 integrated I/Os, of which 6 are digital and 5 are configurable (U/I/T) analog inputs, 6 are digital and 5 are configurable (U/I/PWM/PPM) analog outputs. Integrated Modbus SL interface that also enables remote downloading. 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.