FWA-ECODR3-SMT-01VRS-MS
FWA-ECODR3-SMT-01VRS-MS
FWA-ECODR3-SMT-01VRS-MS
5、结构化文本语言（ST）
结构化文本语言是用结构化的描述文本来描述程序的一种编程语言。它是类似于高级语言的一种编程语言。在大中型的PLC系统中，常采用结构化文本来描述控制系统中各个变量的关系。主要用于其他编程语言较难实现的用户程序编制。
结构化文本编程语言采用计算机的描述方式来描述系统中各种变量之间的各种运算关系，完成所需的功能或操作。大多数PLC制造商采用的结构化文本编程语言与BASIC语言、PASCAL语言或C语言等高级语言相类似，但为了应用方便，在语句的表达方法及语句的种类等方面都进行了简化。
结构化文本编程语言的特点：采用高级语言进行编程，可以完成较复杂的控制运算；需要有一定的计算机高级语言的知识和编程技巧，对工程设计人员要求较高。直观性和操作性较差。
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