AS-BADU-254
AS-BADU-254
AS-BADU-254
组合逻辑设计法适合于设计开关量控制程序,它是对控制任务进行逻辑分析和综合,将元件的通、断电状态视为以触点通、断状态为逻辑变量的逻辑函数,对经过化简的逻辑函数,利用PLC逻辑指令可顺利地设计出满足要求且较为简练的程序。这种方法设计思路清晰,所编写的程序易于优化,。
用组合逻辑设计法进行程序设计一般可分为以下几个步骤:
1)明确控制任务和控制要求,通过分析工艺过程绘制工作循环和检测元件分布图,取得电气执行元件功能表。
2)详细绘制系统状态转换表。通常它由输出信号状态表、输入信号状态表、状态转换主令表和中间记忆装置状态表四个部分组成。状态转换表全面、完整地展示了系统各部分、各时刻的状态和状态之间的联系及转换,非常直观,对建立控制系统的整体联系、动态变化的概念有很大帮助,是进行系统的分析和设计的有效工具。
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厦门泰尼电气有限公司
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厦门泰尼电气有限公司
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