versatility and flexibility poor
Early in the automatic control system is to rely on relay - contactor to achieve, and its features are: simple, inexpensive, anti-interference ability, can achieve centralized control and remote control, but its fixed wire, versatility and flexibility poor;
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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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