梯形逻辑 Ladder logic
（重定向自Relay Ladder Logic）
梯形逻辑（英语：Ladder logic）是指一种通过基于继电器逻辑电路图的图形来代表进程的一种编程语言。它主要在工业控制应用中被用于开发可编程逻辑控制器（Programmable Logic Controllers, PLCs）的软件。“梯形逻辑”的命名主要是基于这种语言的进程看起来像一个一级一级的梯子：具有两条是指边和其间的一系列水平的梯级。
Relay Ladder Logic
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英语百科
Ladder logic 梯形逻辑
（重定向自Relay Ladder Logic）
Ladder logic was originally a written method to document the design and construction of relay racks as used in manufacturing and process control. Each device in the relay rack would be represented by a symbol on the ladder diagram with connections between those devices shown. In addition, other items external to the relay rack such as pumps, heaters, and so forth would also be shown on the ladder diagram. See relay logic.
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