描述
2.32位双向计数器
32位双向计数器C200~C234的的设定值为–2147483648~+2147483647,其加/减计数方式由特殊辅助继电器M8200~M8234设定,对应的特殊辅助继电器为ON时,为减计数,反之为加计数。
32位计数器的设定值除了可由常数K设定外,还可以通过指定数据寄存器来设定,32位设定值存放在元件号相连的两个数据寄存器中。如果指定的是D0,则设定值存放在D1和D0中。图3–14中C200的设定值为5,在加计数时,若计数器的当前值由4–5,计数器的输出触点ON,当前值≥5时,输出触点仍为ON。当前值由5–4时,输出触点OFF,当前值≤4时,输出触点仍为OFF。
计数器的当前值在最大值2147483647时加1,将变为最小值–2147483648,类似地,当前值–2147483648减1时,将变为最大值2147483647,这种计数器称为“环形计数器”。
图3–14中复位输入X13的常开触点接通时,C200被复位,其常开触点断开,常闭触点接通,当前值被置为如果使用电池后备/锁存计数器,在电源中断时,计数器停止计数,并保持计数当前值不变,电源再次接通后在当前值的基础上继续计数,因此电池后备/锁存计数器可累计计数。
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