描述
在PLC系统结构不断发展的同时，PLC的编程语言也越来越丰富，功能也不断提。除了大多数PLC使用的梯形图语言外，为了适应各种控制要求，出现了面向顺序控制的步进编程语言、面向过程控制的流程图语言、与计算机兼容的语言（BASIC、C语言等）等。多种编程语言的并存、互补与发展是PLC进步的一种趋势。
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