求翻译：通过modscan单独和任何一台测试通讯速度都较快的，但是四台PLC一起连到DCS其中有两台通讯很慢，要过个好几分钟才有数据变化，有一台甚至一天都不怎么变化，而且都是通讯一段时间后，突然又通讯不上了，这两台plc也出现过端口烧坏问题，后面又修好了，请问通讯速度那么慢是上位机还是下位机的问题？四台plc程序一模一样的除了站点不一样，端口没加隔离有没有关系？是什么意思？

By modscan any one test alone, and the communication speed is faster, but the four PLC connected to the DCS with two communication which is very slow, only a few minutes to have a good data changes, there is a change in how not even one day, And all communication for some time, suddenly not on the c

modscan through separate and any test communication speed is faster, however 4 Taiwan PLC DCS together two of them connected to the communication is slow, you have a good few minutes before we have a data change, it will be a Taiwan and even a single day, and all of them aren't change communication

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Through modscan separate and any a Taiwan test communications speed are more fast of, but four Taiwan PLC together even to DCS which has two Taiwan communications is slow, to had a several minutes is data changes, has a Taiwan even a days are does not how changes, and are is communications a time Ho