执行3条或4条指令时,分别取出xl或X2对应的输入映像寄存器中的二进制数,因为是常闭触点,取反后与前面的运算结果相“与”(电路的串联对应“与”运算),然后存入运算结果寄存器。
执行5条指令时,将运算结果寄存器中的二进制数送入Y0对应的输出映像寄存器。 在输出处理阶段,CPU将各输出映像寄存器中的二进制数传送给输出模块并锁存起来,如果Y0对应的输出映像寄存器存放的是二进制数1,外接的KM的线圈将通电,反之将断电。
如果读入输入映像寄存器X0~X2的均为二进制数0,在程序执行阶段,经过上述逻辑运算过程之后,运算结果仍为Y0=0,所以KM的线圈处于断电状态。按下起动按钮SBl,X0变为l状态,经逻辑运算后Y0变为1状态,在输出处理阶段,将Y0对应的输出映像寄存器中的1送到输出模块,PLC内Y0对应的物理继电器的常开触点接通,接触器KM的线圈通电.
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