The traditional central air conditioning system consumes a large amount of energy and is difficult to automatically adjust the water and air volume,so that the environmental parameters are difficult to control,and cannot meet the requirements of the production workshop for cleanliness.In view of the above problems,PLC is used to control and design the circulating air conditioning system.The hardware uses the Siemens PLC,temperature sensors,pressure sensors,variable frequency fans,regulating water valves and actuators.The software uses the TIA Portal software to write PLC control programs to achieve the input and output processing of analog and digital quantities,and perform PID regulation for variable frequency fans,regulating water valves and actuators to achieve the purpose of energy saving.The MCGS Pro configuration software is adopted for the design of the configuration interface to realize the online dynamic monitoring and control of the circulating air conditioning system.
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