This communication module is part of the Modicon M171/M172/M173 range, a control offer for HVAC/Pumping applications. This optional module provides a specific connection to the Modbus SL (RS485) bus. It has two screw terminal blocks as a communication port. It allows the HVAC controller to manage Data on the Modbus SL (RS485) bus. It measures 100mm high, 35mm wide and 53.93mm deep, and weighs 0.077kg. This communication module allows controllers to get an additional communication port. It is certified by CE, CSA, cURus, and EAC. It is compatible with M172 Optimized, M172 Performance, and M171 Performance logic controllers. It is sold in a 1-piece package. It is mounted by simply interlocking on the left-hand side of M171 Performance or M172 logic controllers. Modicon M171/M172/M173 controllers are designed for complete automation solutions for HVAC and Pumping machines. Modicon M171/M172/M173 range is for OEMs and helps to maximize profitability or energy efficiency in HVAC applications.