IS220PTCCH2A GE

GE IS220UCSAH1A
GE IS230PCAAH1A
GE IS230SRTDH2A
GE IS230STAIH2A
GE IS230STTCH2A

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Description

I/O映象区中的相应单元的状态和数据也不会改变。在用户程序执行阶段,PLC按由上而下、先左后右的顺序依次地扫描程序(梯形图),根据逻辑运算的结果,刷新RAM存储区或I/O映象区对应单元的状态。在输出刷新阶段,根据I/O映象区内对应的状态和数据刷新所有的输出锁存电路,再经输出电路驱动相应的外设,这时,才是PLC的真正输出。

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