CAJ | 학술논문

采用PLC为主控制器、变频器为执行器，MCGS监控软件为人机交互界面，设计了一套液位控制系统，并利用西门子S7-200PLC的PID参数自整定功能实现了控制参数的在线自调整。MCGS监控软件构成了控制系统的操作站，可以实现实时数据采集、控制参数输入、控制模式转换等多项功能。在液位控制实验中，MCGS监控软件记录了在设定液位下的PID参数整定过程和设定液位控制效果，S7-200PLC整定出的PID参数较好地实现了设定液位的稳定跟踪。整套系统具有控制灵活、精确度高、故障率低的特点，能满足一般化工生产过程中对液位的控制要求。
채용PLC위주공제기、변빈기위집행기，MCGS감공연건위인궤교호계면，설계료일투액위공제계통，병이용서문자S7-200PLC적PID삼수자정정공능실현료공제삼수적재선자조정。MCGS감공연건구성료공제계통적조작참，가이실현실시수거채집、공제삼수수입、공제모식전환등다항공능。재액위공제실험중，MCGS감공연건기록료재설정액위하적PID삼수정정과정화설정액위공제효과，S7-200PLC정정출적PID삼수교호지실현료설정액위적은정근종。정투계통구유공제령활、정학도고、고장솔저적특점，능만족일반화공생산과정중대액위적공제요구。
A liquid level control system which is made up of PLC as controller, frequency transformer as executable device and MCGS software as monitor interface is designed. Its PID control parameters are set on-line using the self-tuning function of Siemens S7-200 PLC. The MCGS monitoring software is used as control system operator station which can achieve the functions such as real-time data acquisition, control parameter input, control mode conversion and so on.In the liquid level control experiment,the setting process of PID control parameters and the control effect of set liquid level is memorized by MCGS monitor software. The PID control parameters which are set by S7-200 PLC realize steady tracking to the set liquid level. The entire system has characteristics of flexible control, high accuracy and low failure.It can satisfy the control requirements of general chemical production process.