1756-L73SXT

1756-L73XT

1756-L74

1)PLC梯形图中的某些编程元件沿用了继电器这一名称，如输入继电器、输出继电器、内部辅助继电器等，但是它们不是真实的物理继电器(即硬件继电器)，而是在软件中使用的编程元件。每一编程元件与PLC存储器中元件映像寄存器的二个存储单元相对应。以辅助继电

器为例，如果该存储单元为0状态，梯形图中对应的编程元件的线圈“断电”，其常开触点断开，常闭触点闭合，称该编程元件为0状态，或称该编程元件为OFF(断开)。该存储单元如果为1状态，对应编程元件的线圈“通电”，其常开触点接通，常闭触点断开，称该编程

元件为l状态，或称该编程元件为ON(接通)。

2)根据梯形图中各触点的状态和逻辑关系，求出与图中各线圈对应的编程元件的ON/OFF状态。，称为梯形图的逻辑解算。逻辑解算是按梯形图中从上到下、从左至右的顺序进行的。解算的结果，马上可以被后面的逻辑解算所利用。逻辑解算是根据输入映像寄存器中的值

，而不是根据解算瞬时外部输入触点的状态来进行的。

3)梯形图中各编程元件的常开触点和常闭触点均可以无限多次地使用。

4)输入继电器的状态唯一地取决于对应的外部输入电路的通断状态，因此在梯形图中不能出现输入继电器的线圈。，

联系人：黄经理

联系电话：0797-8112001 19179070397

联系QQ：2894392162

公司传真：0797-8112002

公司全称：江西融泰电气设备有限公司

公司地址：江西省赣州市章贡区阳明国际3号楼1205

同时，嵌入式PLC的硬件、软件、人机界面、通信等各方面的功能设计灵活，易于剪裁，更贴近各种档次的机电设备的要求。嵌入式PLC完全基于嵌入式系统的技术基础，拿来就可用。SOC芯片、嵌入式操作系统与符合工EC61131-3编程语言标准的编程环境等优势，使得其

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