西门子PLC快速查找数据算法
1、当我们在一个 **链表** 或者 **顺序表** 中 **查找** 一个数据元素 是否存在 的时候，唯一的方法就是**遍历**整个表，这种方法称为 **线性枚举**。如果这时候，**顺序表是有序**的情况下，我们可以采用**折半**的方式去查找，这种方法称为 **二分枚举**。线性枚举 的时间复杂度为 O ( n ) ，二分枚举 的时间复杂度为 O ( l o g 2 n )
2、PLC查找数据一般使用场景：在博图软件中预先定义好数组，根据数组下标索引到数据；那这就是一个典型的底层实现结构是一个数组，数组类型可以是任意类型，而且数组下表是有序的，那我们完全可以使用折半查找代替遍历整个表，以此通过算法节省CPU扫描时间，提升设备相应速度！（如定义1...10,快速找到上位下发第N个数组下标所存储的数据）；其优势在数组内容较大时明显
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