IC647PRTHE100M

IC647PRTHE100M,IC647PRTHE100M,IC647PRTHE100M

步进梯形图和指令表程序的编程方法

1.  状态转换的实现

步与步之间的状态转换需满足两个条件：

Ø  前级步必须是活动步；

Ø  对应的转换条件要成立。

满足上述两个条件就可以实现步与步之间的转换。值得注意的是一旦后续步转换成功成为活动步，前级步就要复位成为非活动步。

2.  FX系列PLC的步进顺控指令

FX系列 PLC的步进指令有两条：步进触点驱动指令STL和步进返回指令RET。

STL：步进触点驱动指令 梯形图符号为

 

①  STL指令有主控含义，即STL指令后面的触点要用LD指令或LDI指令。

②  STL指令有自动将前级步复位的功能（在状态转换成功的第二个扫描周期将前级步复位）。

步进返回指令 梯形图为

 

一系列STL指令后，在状态转移程序的结尾必须使用RET指令，表示步进顺控功能（主控功能）结束 。

3.  步进梯形图和指令语句表编程：

① 先进行驱动动作处理，然后进行状态转移处理，不能颠倒。

② 驱动步进触点用STL指令，驱动动作用OUT指令。若某一动作在连续的几步中都需要被驱动，则用SET指令。

③ 连续向下的状态转换用SET指令，否则用OUT指令。

④ 相邻两步的动作若不能同时被驱动，则需要安排相互制约的联锁环节。

⑤ CPU只执行活动步对应的电路块，因此， STL指令允许双线圈输出。

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