TB806模块
TB806模块
产品别名 |
TB806 |
面向地区 |
全国 |
SPN56265F
RDBB410147B72AA
RDBB410167B72AA
PLC的用户程序执行过程 对于用户来说,在编写用户程序或选择设备时,清楚下面介绍的三个阶段,即用户程序执行过程的原理。 PLC采用集中处理的方法,即对输入扫描信号、执行用户程序和输出刷新都采用集中分批处理的工作方式。 (1)输入扫描 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,并将输入信号存入输入映像区,输入映像存储器被刷新。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。
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