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廈門泰尼電氣有限公司
主營產(chǎn)品： AB模塊PLC |
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廈門泰尼電氣有限公司
主營產(chǎn)品： AB模塊PLC |
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更新時間：2015-01-15 09:30:34瀏覽次數(shù)：234
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存儲器的輸出端是連接在數(shù)據(jù)總線上的。數(shù)據(jù)總線相當(dāng)于一條車流頻繁的大馬路，必須在綠燈條件下，車輛才能進(jìn)入這條大馬路，否則要撞車發(fā)生交通事故。同理，存儲器中的數(shù)據(jù)是不能隨意傳送到數(shù)據(jù)總線上的。例如，若數(shù)據(jù)總線上的數(shù)據(jù)是“1"(高電平5V)，存儲器中的數(shù)據(jù)是“0"(低電平0V)，兩種數(shù)據(jù)若碰到一起就會發(fā)生短路而損壞單片機(jī)。因此，存儲器輸出端口不僅能呈現(xiàn)“l"和“0"兩種狀態(tài)，還應(yīng)具有第三種狀態(tài)“高阻"態(tài)。呈“高阻"態(tài)時，輸出端口相當(dāng)于斷開，對數(shù)據(jù)總線不起作用，此時數(shù)據(jù)總線可被其他器件占用。當(dāng)其他器件呈“高阻"態(tài)時，存儲器在片選允許和輸出允許的條件下，才能將自己的數(shù)據(jù)輸出到數(shù)據(jù)總線上。
公司 名稱：廈門泰尼電氣有限公司
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公司地址：廈門市海滄區(qū)海滄街道濱湖一里7號2008室
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SQUARE D 30T142HIS SORGEL INSULATED TRANSFORMER, 30 kVa
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ALLEN BRADLEY 2112B FUSIBLE COMINATION STARTER 2100 MCC
2112B-BDBD-9-2?1-24R-41-79U-1?06-107-9008
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ALLEN BRADLEY 10HP VARIABLE FREQUENCY AC DRIVE 1336S-BR
ALLEN BRADLEY SMC PLUS 24A SMART MOTOR CONTROLLER 150-A
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ALLEN BRADLEY 10HP VARIABLE FREQUENCY AC DRIVE 1336S-BR
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