描述
高速计数器一般按四类分别命名:
1相无启动/复位端子:C235∽C240;
1相双向:C246∽C250;
2相A-B相型:C251∽C255;
高速计数器与输入端子(输入继电器)之间的约定如下表:
注:U-增计数输入;D-减计数输入;A-A相输入;B-B相输入;R-复位输入;S-启动输入。
高速计数器是按中断原则运行的,因而它独立于扫描周期,选定计数器的线圈应以连续方式以表示这个计数器及其有关输入连续有效,其他高速处理不能再用其输入端子。
(1)1相型高速计数器C235∽C240
C235∽C240无启动/复位端设定值范围
C241∽C245有启动/复位端-2147483648∽+214783648
说明:
n作增计数器时,当计数值达到设定值时,触点动作并保持;作减计数时,到达计数值则复位。
n1相计数器的计数方向取决于其对应标志M8□□□,□□□为对应计数器号C235∽C245。
(2)1相双向高速计数器C246∽C250
1相双向计数器具有一个输入端用于增计数,另一个输入端用于减计数。需增还是需减要从不同输入端上安排,而不是再运用特殊辅助继电器约定。某些计数器还具有复位和启动输入。
(3)2相A-B相型高速计数器:C251∽C255
2相2输入(C251∽C255,1个或2个,电池后备)最多可有2个2相32位二进制增/减计数器。它是采用中断方式计数,与扫描周期无关。这些计数器还有一些独立于逻辑操作的执行比较和输出操作的应用指令。选定计数器元件后,对应的启动、复位及输入信号就能使用。A相和B相信号决定了计数器是增计数还是减计数。
如:当A相波形为ON状态时:
B相输入OFF→ON:增计数
B相输入ON→OFF:减计数
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