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MOTOROLA 01-W3960B
厦门仲鑫达自动化设备有限公司
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MOTOROLA 01-W3960B
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厦门市思明区湖滨东路湖光大厦8楼A座
攀钢污水处理厂供水管网比较庞大，管网水压对水泵转速的变化响应比较缓慢， 因此PID的计算速度不能过快，即比例调节不能过快，否则如果管网水压突然变化大时，变频器的调节容易形成较长时间的振荡。根据这一情况，如图3所示，可以在PLC控制程序中加入PID间隔计算时间 （T0）以及PID运算死区（M0），这样就可以把PID的计算速度调节至与管网水压变化速度相一致，避免管网水压震荡。
（4）PLC功能指令实现PLC与变频器上位机通信
为了使变频器上位机能对PLC进行显示、报警及记录，PLC还配置了通信模块FX2N-232BD，实现与变频器上位机的串口通信，通信编程指令如图4所示。
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