3BDH001010R0001 CI930F

３．２ ＨＭＩ与ＰＬＣ之间的通讯 

  当ＨＭＩ用于ＰＬＣ控制系统时，ＨＭＩ与ＰＬＣ之间通过串口以Ｄｉｒｅｃｔ Ｌｉｎｋ直接连接 方式进行通讯。在该方式下，ＨＭＩ根据要求直接读入ＰＬＣ的数据或把数据写入ＰＬＣ相应的地址中。由于内装通讯协议，因此无须编制通讯程序，只要指定所用ＰＬＣ类型即通讯协议 ，运行时便可实现通讯。因此大大减少了ＰＬＣ用户程序的负担。在系统设计时，直接指定控制部件与其对应ＰＬＣ的输入输出％Ｉ／Ｏ 、寄存器％Ｒ、中间寄存器％Ｍ 的地址，运行时ＨＭＩ就能自动和ＰＬＣ进行数据交换。直接读取或改写ＰＬＣ相应地址的内容，并据此改变画面上显示内容。同时通过对ＨＭＩ的触摸操作，可向ＰＬＣ相应的地址输入数据。 

  ３．３ ＨＭＩ监控主面

  整个ＨＭＩ监控系统采用树型结构，由监控主画面见图２ 及相应功能子画面组成。在监控主画面下端设有控制
功能键，按动功能键可以依次进入相应子画面，执行所需的功能。在每一个子画面中可通过 上一页 、 下一页 功能键在同一功能组中进行画面切换，在任一子画面都可以通过 主画面 功能键退回到监控主画面。系统自动采集相关数据，将切割计划、测量脉冲、辊道速度等一些重要生产工艺参数显示在主画面上，便于操作人员的观察。监控主画面上还有生产过程的动态画面显示，在动态画面上以各种形式模拟出主要控制设备的运行情况，例如光电开关​
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厦门莫格电气自动化有限公司
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