140CRA21120
140CRA21120
140CRA21120
PLC执行程序的过程分为三个阶段，即输入采样阶段、程序执行阶段、输出刷新阶段，PLC的扫描工作过程:
（1）输入采样阶段。在这一阶段中，PLC以扫描方式读入所有输入端子上的输入信号，并将各输入状态存入对应的输入映像寄存器中。此时，输入映像寄存器被刷断。在程序执行阶段和输出刷新阶段中，输入映像存储器与外界隔离，其内容保持不变，直至下一个扫描周期的输入扫描阶段，才被重新读入的输入信号刷新。可见，PLC在执行程序和处理数据时，不直接使用现场当时的输入信号，而使用本次采样时输入到映像区中的数据。一般来说，输入信号的宽度要大于一个扫描周期，否则可能造成信号的丢失。
＆ 公司全称 ： 厦门泰尼电气有限公司
＆ 销售代表 ： 小黄
＆ 洽谈电话 ：
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＆ 商务 QQ ： 2917675397
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＆ 公司地址 ： 厦门市海沧区海沧街道滨湖一里7号
＆ 公司网址 ： www.xmtaini.com
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