描述
1.位元件
FX系列PLC有4种基本编程元件,为了分辨各种编程元件,给它们分别指定了专用的字母符号:
x:输入继电器,用于直接输入给PLC的物理信号。
Y:输出继电器,用于从PLC直接输出物理信号。
M(辅助继电器)和S(状态继电器):PLC内部的运算标志。
上述的各种元件称为“位(bit)元件”,它们只有两种不同的状态,即ON和OFF,可以分别用二进制数l和0来表示这两种状态。
2.字元件
8个连续的位组成一个字节(Byte),16个连续的位组成一个字(Word),32个连续的位组成一个双字(DoubleWord)。定时器和计数器的当前值和设定值均为有符号字,最高位(第15位)为符号位,正数的符号位为0,负数的符号位为1。有符号字可表示的最大正整数为32767。
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