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22B-A8P0C104
22B-A8P0C104
PLC的存储单元(即编程元件)存储的数据都是二进制数。数据的长度称为字长,字长可分为位(1位二进制数,用b表示)、字节(8位二进制数,用B表示)、字(16位二进制数,用W表示)和双字(32位二进制数,用D表示)。
2. 数据的类型和范围
S7-200 SMART PLC的存储单元存储的数据类型可分为布尔型、整数型和实数型(浮点数)。
1)布尔型
布尔型数据只有1位,又称位型,用来表示开关量(或称数字量)的两种不同状态。当某编程元件为1时,称该元件为1状态,或称该元件处于ON状态,该元件对应的线圈“通电”,其常开触点闭合,常闭触点断开;当该元件为0时,称该元件为0状态,或称该元件处于OFF状态,该元件对应的线圈“失电”,其常开触点断开,常闭触点闭合。例如,输出继电器Q0.0的数据为布尔型。
2)整数型
整数型数据不带小数点,它分为无符号整数和有符号整数,有符号整数需要占用1个高位表示数据的正负,通常规定高位为0表示数据为正数,为1表示数据为负数。表6-1列出了不同字长的整数表示的数值范围。
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