1746-HT 罗克韦尔

　　

　　PLC程序的编制直接关系着供气系统能否正常工作，而液压机程序设计的关键在于编程者对工艺系统的理解程度和程序编制技术的灵活应用。因此，在程序设计中首先考虑了供气压力调节系统的特点，将程序设计细化，分成多个程序模块，实行模块化编程。这样既可以方便的增加或删除程序模块，便于现场对工艺的调整，又可针对配套设备可控性对不同程序模块进行完善。

　　

　　PLC的编程软件采用SIEMENS公司的SIMATICSTEP7V5.1软件平台用来完成硬件组态、地址和站址的分配以及编制整个生产过程的控制程序的。上位机监控软件采用国产软件组态王，全部采用汉化界面，便于系统的开发与操作，该系统运行于Windows2000中文平台，可实现对生产过程的全面监控，对重要参数形成历史记录，以报表或曲线的形式显示给操作人员。通过VB语言脚本，可以在主控室的上位机显示重要参数的历史趋势、实时趋势，实现压力调节的手自动切换、操作、压力的高、低限报警、流量数据的显示与累计，满足高生产率的调度需求。

GAIN＝比例增益

1。PID是一种控制算法，是比例作用P、积分作用I、和微分作用D的总称。这三个作用可合成和分离成PI、PD，和PID这几个作用。

2。先看一下PID的模拟算法公式：

  e（t）＝SP（t）－PV（t）；

  OUT（t）＝GAIN * e（t）* （1＋* T/TI+TD/T）;

   OUT（t）＝LMN_P+LMN_I+LMN_D

其中：LMN_P＝GAIN * e（t）；即比例作用项P

      LMN_I＝GAIN * e（t）* T/TI；即积分作用项I

            LMN_D＝GAIN * e（t）* TD/T；即微分作用项D

  公式中，T＝采样时间；e（t）＝偏差值；TI＝积分时间；TD＝微分时间；GAIN＝比例增益；

由此可知，PID的运算输出是OUT（t）是比例作用项P（LMN_P）、积分作用项I（LMN_I），和微分作用项D（LMN_D）三项同时作用的总和。

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