ABB DO620
當(dāng)保存/裝載數(shù)據(jù)文件時(shí),需要遵守下列規(guī)則:
●在一個(gè)扇區(qū)內(nèi)數(shù)據(jù)集中的數(shù)據(jù)個(gè)數(shù)必須相同。
●不同扇區(qū)內(nèi)數(shù)據(jù)集中的數(shù)據(jù)個(gè)數(shù)可以不同。
●同一數(shù)據(jù)集中數(shù)值的格式必須相同(BYTE, WORD, IN..)。
●一個(gè)扇區(qū)內(nèi)數(shù)據(jù)集可以具有不同數(shù)據(jù)格式。(警告: 當(dāng)讀入這些數(shù)據(jù)時(shí),用戶必須了解它們的結(jié)構(gòu))
●當(dāng)寫數(shù)據(jù)集時(shí),數(shù)據(jù)集總是添加到文件尾。
●當(dāng)讀取數(shù)據(jù)時(shí),在文件中可以搜索"sector label"。
●可以從一個(gè)特定的扇區(qū)"sector label"開始讀取數(shù)據(jù)集。
●扇區(qū)內(nèi)的特定數(shù)據(jù)集不能被讀或?qū)憽?
●如果你要分別讀取每個(gè)數(shù)據(jù)集，在每個(gè)數(shù)據(jù)集前必須插入一個(gè)"sector label"
●在用戶程序中讀和寫數(shù)據(jù)可以采用功能塊SD_ READ和SD_ _WRITE來實(shí)現(xiàn)。
●數(shù)據(jù)集的值必須以變量的形式連續(xù)存儲在PLC中(如: ARRAY, STRING, %M area).
●數(shù)據(jù)文件可以在PLC程序中刪除。
●每個(gè)數(shù)據(jù)集和/或扇區(qū)不能由用戶程序刪除。要?jiǎng)h除數(shù)據(jù)集必須在PC.上用ASCII編輯器來實(shí)現(xiàn)。
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