MVI69-HART

MVI69-HART

MVI69-HART

编写梯形图程序时应遵循的规则：

（1）“输入继电器”的状态由外部输入设备的开关信号驱动，程序不能随意改变它。

（2）梯形图中同一编号的“继电器线圈”只能出现一次，通常不能出现，但是它的触点可以次地重复使用。

编写梯形图程序时应遵循的规则：

（3）几个串联支路相并联，应将触点多的支路安排在上面；几个并联回路的串联，应将并联支路数多的安排在左面。按此规则编制的梯形图可减少用户程序步数，缩短程序扫描时间。

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