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An economical solution for HVAC control and pumping control applications. These PLCs focus on control of HVAC, refrigeration and pumping systems with flexible scheduling, occupancy sensing and analog controls. The software is SoMachine HVAC, a powerful configuration software compliant with IEC 61131-3. (Not included with or related to SoMachine or SoMachine Basic.) M171 & M172 controllers can handle small to very large machines and can be networked to handle large systems.