该方法无需增加硬件开销，应用成本低，适应性强。

This method dispenses with adding hardware, so it has such characteristics as less application cost and high adaptability.

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在这种情况下，可以根据实际的服务使用来增加硬件需求。

In this case, you can grow hardware requirements based on actual service use.

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PLC可编程序控制器在应用中常遇到由于输入点不够而增加硬件设置的问题。

In application of PLC programmable controllers, it is ofter to meet with the problem to have to add hardware installations due to that the input points are not enough.

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