These modules have enhanced the control performance of PLC, However there are many problem of them, such as privacy technologies, lack of flexibility, poor versatility, expensive and so on.
虽然这些模块提高了PLC的控制性能，但存在技术封闭，缺乏灵活性，通用性差，价格昂贵等不足。
These modules have enhanced the control performance of PLC, However there are many problem of them, such as privacy technologies, lack of flexibility, poor versatility, expensive and so on.
虽然这些模块提高了PLC的控制性能，但存在技术封闭，缺乏灵活性，通用性差，价格昂贵等不足。
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