基于PLC的水箱温度控制系统

毕业设计论文AbstractIn this paper,is the programmable controller in the water tank temperaturecontrol system application,water tank temperature control system is mainly usedto complete the tank liquid level and temperature detection,and adjust thetemperature parameters.System,temperature control is a very important part.By platinum RTD temperature measurement will be measured in the temperaturereached the PLC.PLC on the collected temperature values compared with a givenvalue,after a PID operation,the regulator Triac off the set period of time theratio of change in heating wire in the current size and heating time to completethe right temperature control requirements.The system hardware mainly by the CPU224,EM235,bi-directional thyristoretc.;software,some of the major by the PID control to complete.Key words:PLC CPU224 EM235 Triac PID Control