KAWASAKI 50999-1702
KAWASAKI 50999-1702
KAWASAKI 50999-1702
1,输入采样阶段
PLC顺序读取每个输入端的状态,并将其存入到我们称之为输入映像寄存器的内在单元中。当进入程序执行阶段,如输入端状态发生改变.输入映象区相应的单元信息并不会跟着改变,只有在下一个扫描周期的输入采样阶段,输入映象区相应的单元信息才会改变。因此,PLC会忽视掉小于扫描周期的输入端的开关量的脉冲变化。
2,程序执行阶段
PLC从程序0步开始,按先上后下,先左后右的顺序扫描用户程序并进行逻辑运算。PLC按输入映象区的内容进行逻辑运算,并把运算结果写入到输出映象区,而不是直接输出到端子。
备货,备货,降降降,火火火,火火火……
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