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ITCC DO卡件 3625
（1） 基本方法。
根据继电器电路图来设计PLC的梯形图时，关键是要抓住它们的一一对应关系，即控制功能的对应、逻辑功能的对应以及继电器硬件元件和PLC软件元件的对应。
（2） 转换设计的步骤。
1） 了解和熟悉被控设备的工艺过程和机械动作情况，根据继电器电路图分析和掌握控制系统的工作原理。
2） 确定PLC的输入信号和输出信号，画出PLC的外部接线图。
3） 确定PLC梯形图中的辅助继电器（M）和定时器（T）的元件号。
4） 根据上述对应关系画出PLC的梯形图并进一步优化使梯形图既符合控制要求又具有合理性、条理性和可靠性。
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