6SA8252-0LD62
6SE6420-2UD15-5AA1
6SA8252-0LD62
Fu Zhou ZhuoKai Electric Co., Ltd.
1.逻辑常量与变量：逻辑常量只有两个，即0和1，用来表示两个对立的逻辑状态。逻辑变量与普通代数一样，也可以用字母、符号、数字及其组合来表示，但它们之间有着本质区别，因为逻辑变量的取值只有两个，即0和1，而没有中间值。
2.逻辑运算：在逻辑代数中，有与、或、非三种基本逻辑运算。表示逻辑运算的方法有多种，如语句描述、逻辑代数式、真值表、卡诺图等。
3.逻辑函数：逻辑函数是由逻辑变量、常量通过运算符连接起来的代数式。同样，逻辑函数也可以用表格和图形的形式表示。
4.逻辑代数：逻辑代数是研究逻辑函数运算和化简的一种数学系统。逻辑函数的运算和化简是数字电路课程的基础，也是数字电路分析和设计的关键。
式中小圆点“·”表示A、B 的与运算，又称逻辑乘。在不致引起混淆的前提下，乘号“·”被省略。某些文献中，也有用符号 ∧、∩表示与运算的。
真值表：如果开关不通和灯不亮均用0表示，而开关接通和灯亮均用1表示，得到如图1（c）所示的真值表描述。真值表的左边列出为所有变量的全部取值组合，右边列出的是对应于A，B变量的每种取值组合的输出。因为输入变量有两个，所以取值组合有22＝4种，对于n个变量，应该有2n种取值组合。
福州卓凯电子科技有限公司
【诚信】 【质量保证】 【价格优惠】
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