描述
PLC的PID运算调节通过该型处理器专用PID指令完成,通过设置各参数即可由PLC完成PID运算调节。PID程序段流程如图4。PID指令必须以相同的时间间隔周期性地执行,可采用计时器,定时中断或实时采样的等方法,此处选用了定时方法;PV是PID指令采样的压力控制反馈值,SP是PID指令的压力控制设定值,KP为PID的比例增益,KI为PID的积分增益,KD为PID的微分增益,这五个控制参数作为主要的PID参数参与控制,确定PID参数时要兼顾系统灵敏性和稳定性,由于我们恒压控制要求和设备的性能条件,参数设定更强调稳定性(及KI),由于微分环节有放大噪声的特点,我们将KD尽量设置得较小;SWM为PID指令转为手动直接调频的开关,SO设定为PID指令的在手动控制输出方式时的输出值,当变频器从PID自控调节转为手动直接调频时,SO替代PID运算结果作为转换时的输出值,将SO设定为控制值就可实现无缝转换,减小变频器运行频率的震荡。DB为PID指令的死区设定值,输出超出死区时PID指令通过自动运算限制输出超出限定范围。
欧美品牌停产的,常用的“PLC”备品备件
我司产品应用于以下领域:
1,《发电厂DCS监控系统》
2,《智能平钢化炉系统制造》
3,《PLC可编程输送控制系统》
4,《DCS集散控制系统》
5,《智能型消防供水控制系统》
6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
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