1756-L64

 1756-L64 

1756-L64

PLC分配输入/输出点 
　　一般输入点和输入信号、输出点和输出控制是一一对应的。分配好后，按系统配置的通道与


接点号，分配给每一个输入信号和输出信号，即进行编号。在个别情况下，也有两个信号用一个


输入点的，那样就应在接入输入点前，按逻辑关系接好线（如两个触点先串联或并联），然后再


接到输入点。 
　　（1）确定I/O通道范围 
　　不同型号的PLC，其输入/输出通道的范围是不一样的，应根据所选PLC型号，查阅相应的编程


手册，决不可“张冠李戴”。必须参阅有关操作手册。 
　　（2）内部辅助继电器 
　　内部辅助继电器不对外输出，不能直接连接外部器件，而是在控制其他继电器、定时器/计数


器时作数据存储或数据处理用。 
　　从功能上讲，内部辅助继电器相当于传统电控柜中的中间继电器。未分配模块的输入/输出继


电器区以及未使用1：1链接时的链接继电器区等均可作为内部辅助继电器使用。根据程序设计的


需要，应合理安排PLC的内部辅助继电器。

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