程序设计是PLC应用中最关键的问题。PLC程序设计的基本思路是按照设备的要求设
计输入和输出信号的逻辑关系,在输入某些信号时得到预期的输出信号,从而实现预
期的工作过程。因此,简单而常用的方法是以过程为目标,分析每个过程的启动条件
和限制条件,根据这些条件编写该过程的PLC程序,完成了所有过程的PLC程序即完成
了整个PLC程序。
PLC程序设计的常用方法有以下三种:
程序设计的方法有很多,如状态表法、功能图法、流程图法及现代Petri网法 等。
① 状态表法是从传统继电器逻辑设计方法继承而来,经过适当改进,适合于可编程
控制器梯形图设计的一种方法。但状态表法仅适合于单一顺序问题的程序设计,对于具
有并行顺序和选择顺序的问题就显得无能为力了。
②功能图法是先将控制要求表达为功能图,用功能图来说明可编程控制器所要完成
的控制功能,然后由功能图写出逻辑方程,再画出梯形图或写出指令。
③流程图法是熟悉计算机高级语言的程序设计人员常用的程序设计方法。
BANNER LR200 LR-200 16307SENSOR
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ADAPTABEACON 52CR-N5-40WH 120V 0.35A RED TESTED
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PHD TS041X2-E-H4-N-?R2 TS041X2-E-N-R2 SLIDE SENSOR CYL.
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BANNER IA1.53SMTAMOP 23660 9609 FIBER OPTIC CABLE
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(3) MICRO SWITCH FYBC5C5-2 Proximity Sensor
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Banner CM5RA Maxi-AMP Controller in Hoffman A8066CH
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