ADV151-P00 S2

ADV151-P00 S2

ADV151-P00 S2

PLC程序设计步骤。
PLC程序设计一般分为以下几个步骤：
1. 程序设计前的准备工作
程序设计前的准备工作就是要了解控制系统的全部功能、规模、控制方式、输入/输出信号的种类和数量、是否有特殊功能的接口、与其它设备的关系、通信的内容与方式等，从而对整个控制系统建立一个整体的概念。接着进一步熟悉被控对象，可把控制对象和控制功能按照响应要求、信号用途或控制区域分类，确定检测设备和控制设备的物理位置，了解每一个检测信号和控制信号的形式、功能、规模及之间的关系。
2. 设计程序框图
根据软件设计规格书的总体要求和控制系统的具体情况，确定应用程序的基本结构、按程序设计标准绘制出程序结构框图，然后再根据工艺要求，绘出各功能单元的功能流程图。
3. 编写程序
根据设计出的框图逐条地编写控制程序。编写过程中要及时给程序加注释。
4. 程序调试www.plcs。。ｃｎ
调试时先从各功能单元入手，设定输入信号，观察输出信号的变化情况。各功能单元调试完成后，再调试全部程序，调试各部分的接口情况，直到满意为止。程序调试可以在实验室进行，也可以在现场进行。如果在现场进行测试，需将可编程控制器系统与现场信号隔离，可以切断输入/输出模板的外部电源，以免引起机械设备动作。程序调试过程中先发现错误，后进行纠错。基本原则是“集中发现错误，集中纠正错误”。
5. 编写程序说明书
在说明书中通常对程序的控制要求、程序的结构、流程图等给以必要的说明，并且给出程序的安装操作使用步骤等。

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