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投稿
  1. 找知识-找PLC首页
  2. 驱动技术
  3. MM440/430/420/410

MM440 继电器动作

• MM440/430/420/410

请问一下：继电器要实现以下功能，参数该怎么设置？ 谢谢

r21 等于分别等于 5HZ 和 30HZ 时继电器动作，反之不动作，参数怎么设置？

最佳答案

实际频率等于一个确定值（比如5Hz），这种状态的时间可能非常短，而且不稳定，因为5.01Hz和4.99Hz都不等于5Hz，在这么小的范围内波动也是很正常的。所以楼主是不是考虑设定一个范围。举个例子，r21在4.9Hz和5.1Hz之间继电器动作，可以用自由功能块的比较器和与门实现：
P2800=1，使能自由功能块
P2801[0]=1，使能与门功能
P2802[12]=1，使能比较器1
P2802[13]=1，使能比较器2
P2885[0]=21，比较器1的输入1为r21
P2885[1]=2889，比较器1的输入2为常数2889
P2889=9.8%，常数1为4.9Hz
P2887[0]=2890，比较器2的输入1为常数2890
P2887[1]=21，比较器2的输入2为r21
P2890=10.2%，常数2为5.1Hz
P2810[0]=2886，与门输入1为比较器1的输出
P2810[1]=2888，与门输入2为比较器2的输出
P0731=2811，继电器连接与门输出

提问者对于答案的评价：
理解的到位啊，谢谢

原创文章，作者：more0621，如若转载，请注明出处：https://www.zhaoplc.com/plc143349.html

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