（6）发起真空泵电机，乳化锅负压力不断变大，毕竟将到达用户设定值；到达用户设定值后真空泵电机主动间断；
（7）发起乳化锅温度控制，主动对乳化锅进行加热控制，控制方法选用含糊PID恒温控制，乳化锅内材料将被加热到用户设定温度；
（8）当乳化工作结束后，通过排气口减小乳化锅内负压力，当乳化锅压力为零时，翻开出料阀，排出乳化品。
1 导语
可编程控制器是专门为工业控制计划的，在计划和制造进程中厂家采用了多层次抗烦扰方法，使系统能在恶劣的工业环境下与强电设备一同工作。工作的安稳性和可靠性很高，plc整机均匀无缺点工作时间高达几万小时。跟着计算机技术的展开，plc的功用也越来越强，运用越来越便利，因而在工业控制系统中运用日益广泛。但是，整机的可靠性高仅仅保证系统可靠工作的条件，还有必要在计划和设备plc系统进程中选用相应的方法，才华保证系统可靠工作。这篇文章首要论述在计划和设备plc系统进程中的烦扰方法。
2 plc系统的底子构成构造
可编程控制器硬件系统由plc主机、功用i/o单元和外部设备构成，如图1所示。其间plc主机由cpu、存储器、底子i/o模块、i/o拓展接口、外设接口和电源等有些构成，各有些之间由内部系统总线联接。
3 plc系统计划时的抗烦扰方法
3.1 硬件方法
（1） 屏蔽：对电源变压器、基地处理器、编程器等首要部件，选用导电、导磁性出色的材料进行屏蔽处理，以避免外界烦扰信号的影响。

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