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3GK3KA
发布时间:2017-12-08 09:03:19 浏览5次 修改 | 删除 | 顶一下
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地区:厦门
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标签:3GK3KA
发布时间:2017-12-08 09:03:19 浏览5次
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3GK3KA 输入输出、
3GK3KA  价格好、
3GK3KA  卡件
欢迎咨询
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四、消除线间电容避免误动作

电缆的各导线间都存在电容,合格的电缆能把此容值限制在一定范围之内。即使是合格的电缆,当电缆长度超过一定长度时,各线间的电容容值也会超过所要求的值,当把此电缆用于PLC输入时,线间电容就有可能引起PLC的误动作,会出现许多无法理解的现象。这些现象主要表现为:明接线正确,但PLC却没有输入;PLC应该有的输入没有,而不应该有的却有,即PLC输入互相干扰。为解决这一问题,应当做到:

1、使用电缆芯绞合在一起的电缆;

2、尽量缩短使用电缆的长度;

3、把互相干扰的输入分开使用电缆;

4、使用屏蔽电缆。




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