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触点及线圈指令   PLC梯形图语言的编程原则  

1、梯形图由多个梯级组成，每个线圈可构成一个梯级，每个梯级有多条支路，每个梯级代表一个逻辑方程；

2、梯形图中的继电器、接点、线圈不是物理的，是PLC存储器中的位(1=0N；0=0FF)；编程时常开/常闭接点可次引用，线圈输出只能是一次；

3、梯形图中流过的不是物理电流而是“概念电流”，只能从左向右流；

4、用户程序的运算是根据PLC的输入/输出映象寄存器中的内容，逻辑运算结果可以立即被后面的程序使用；

5、PLC的内部继电器不能做控制用，只能存放逻辑控制的中间状态；

6、输出线圈不能直接驱动现场的执行元件，通过I/模块上的功率器件来驱动。

基本逻辑指令以位逻辑操作为主，在位逻辑指令中，除非有特殊说明，操作数的有效区域为：I、Q、M、SM、T、C、V、S、L且数据类型为BOOL触点和线圈指令又分为：标准指令、立即指令、取反指令、正(负)跳变指令。

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Dr. Johannes Heidenhain Y Axis Optical Encoder

Dr. Johannes Heidenhain X-Axis Optical Encoder

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