在美国，大多数参与可编程逻辑控制器（PLC）编程和维护的人员都倾向于认为：梯形图逻辑是PLC的编程语言。这种理念在很大程度上是由PLC的历史、以及美国的工业控制市场是被以梯形图逻辑为主要语言的品牌统治所造成的。TRICONEX 3805E
在计算机和便携式计算机广泛应用于PLC编程之前，经常使用手持式编程器将程序输入到PLC中。在此之前，通常需要绘制用于不同指令的电气图。这就像在PLC出现之前，如何连接原始继电器逻辑一样。在手持设备上，有时会用符号表示不同指令，但是在图形设计的背后，是基于文本的语言。
1994年，电工委员会（IEC）制定了一个可用于定义和规范PLC编程系统的标准IEC61131-3。除了形式化定义诸如计时器和计数器之类的指令外，该标准还定义了5种编程语言。
In the United States, most people who participate in the programming and maintenance of programmable logic controller (PLC) tend to think that ladder logic is the programming language of PLC. This concept is largely caused by the history of PLC and the fact that the industrial control market in the United States is dominated by the brand with ladder logic as the main language. TRICONEX 3805E
Before computers and portable computers were widely used in PLC programming, hand-held programmers were often used to input programs into PLC. Before that, it is usually necessary to draw electrical diagrams for different instructions. This is like how to connect the original relay logic before the emergence of PLC. On handheld devices, symbols are sometimes used to represent different instructions, but behind the graphic design, there is a text-based language.
In 1994, the Electrotechnical Commission (IEC) formulated a standard IEC61131-3 that can be used to define and standardize PLC programming systems. In addition to formally defining instructions such as timers and counters, the standard also defines five programming languages.
客服1