摘要： 介绍了基于事件－条件模式的ＰＬＣ任务描述方法：采用控制任务表（ＣＴＴ：ＣｏｎｔｒｏｌＴａｓｋＴａｂｌｅ）描述ＰＬＣ控制任务。ＣＴＴ是一种面向控制对象、人－机交互式程序设计方法，方便而直观；ＣＴＴ与目标ＰＬＣ无关，用户选定模型库中ＰＬＣ模型后便可自动将ＣＴＴ转换成目标代码，因而具有很强的通用性，且摆脱了代码调试的麻烦；ＣＴＴ的事件－条件模式为运用网论．进行离线实时图形仿真提供了良好的基础。

关键词: PLC编程, 控制任务表, 事件－条件模式, PLC模型

Abstract: This paper introduces a PLC task description method based on event-condition scheme: using Control Task Table(CTT) todescribe control task. CTTs control-object oriented and man-machine interactive programming method make the description convenient andvisual. CTT has no concern with PLC type, it can be automatically converted into object codes as long as PLC model in the model base bespecified. So it has strong generality and frees users from the trouble of code debugging. CTT's event-condition scheme provides foundationfor off-line and real-time graphical simulation of the control task with net theory.

中图分类号: 

• TP391.9