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cyx_0
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樓主  發(fā)表于: 2015-08-13 17:13
凌控LC121S與S7-300不能通訊，COM2\COM3勻不能通訊，檢查發(fā)現三只6A8.1損壞它是共陽(yáng)極穩壓雙二極管更換后應不能通訊，更換其端口芯片6LB184后通訊正常。軟件轉232時(shí)，3卻4.95V。7腳－4.95V正常，軟件轉485，6腳0.2V，7腳4.95V正常，上機OK.
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