Description
而常常采用面向控制过程、面向问题的“自然语言”编程。国际电工委员会(IEC)1994年5月公布的IEC1131-3(可编程控制器语言标准)详细地说明了句法、语义和下述5种编程语言:功能表图(sequentialfunctionchart)、梯形图(Ladderdiagram)、功能块图(Functionblackdiagram)、指令表(Instructionlist)、结构文本(structuredtext)。
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