Due to many PLC manufactories, many company has special net communication means, many kinds of PLC can not compatible, there has no definite standard.
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但是PLC的生产厂家众多,各公司都有自己专用网络通讯手段,各种机型互不兼容,没有明确一致的标准,在编程元件的种类、数目、编程语言等方面各不相同,互不兼容。
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