IC200TBX220，IC200TBX220IC200TBX220
AB 大型PLC在行李自動分揀系統(tǒng)中的應用
行李分揀系統(tǒng)（BHS）控制離港和到港兩部分系統(tǒng)設備，,采用信息網(wǎng)、控制網(wǎng)和遠程I/O鏈路三級控制結構。兩臺離港上位控制機采用WINDOWS NT4.0操作系統(tǒng)和INTOUCH 7.0工業(yè)組態(tài)軟件，互為熱備，配置雙網(wǎng)卡，除與機場計算機集成系統(tǒng)（SI）以及計算機離港控制系統(tǒng)（DCS）構成以太網(wǎng)外，還與下位主控制器PLC構成以太網(wǎng)。PLC選用 A-B公司的兩臺大型處理器PLC-5/80，互為熱備。 PLC-5/80不僅具有豐富的邏輯處理能力，并具有非常強大的數(shù)據(jù)處理能力。系統(tǒng)結構如圖1所示。
2.2 自動分揀原理
行李自動分揀系統(tǒng)（BHS）必須和機場計算機集成系統(tǒng)（SI）以及計算機離港控制系統(tǒng)（DCS）進行實時的數(shù)據(jù)交換，并把獲得的數(shù)據(jù)發(fā)送給下位PLC-5/80進行處理。網(wǎng)絡拓撲結構如圖2。
PLC-5/80必須獲取以下三種數(shù)據(jù)信息：
A． 航班信息。此信息由行李分揀系統(tǒng)上位機從機場計算機集成系統(tǒng)的航班數(shù)據(jù)庫讀取，并轉發(fā)給下位PLC。航班信息包含的內(nèi)容有：航班號、目的地代碼、值機開始時間、值機結束時間、起飛時間。
B． BSM報文（Baggage Source Message）。旅客在辦理行李交運時，由值機計算機生成。民航總局的報文主機采集此信息，發(fā)送到機場計算機離港系統(tǒng)，然后通過行李分揀系統(tǒng)的報文接口機發(fā)送給行李分揀上位控制機，上位控制機將報文通過內(nèi)部LAN傳遞給PLC 。行李報文包含有航班號、 目的地代碼、流水號、行李件數(shù)等信息.。
C． 行李條碼信息。行李條碼包含行李流水號，旅客在辦理行李交運時，由值機計算機生成，并被打印成條型碼標簽貼在旅客交運的行李上。當行李通過掃描站時，條型碼信息被讀碼器自動掃描，并傳遞給PLC 。
要實現(xiàn)自動分揀，PLC必須對得到的數(shù)據(jù)信息進行兩次比較。首先，PLC將行李條碼信息和報文信息進行逐一比較，如果行李條碼信息和報文信息中有相同的行李流水號，就判定此條碼和報文屬于同一行李的信息（條碼信息包含有行李流水號，報文中包含有行李流水號和航班號信息）；然后，報文信息和PLC中的航班分配表中的航班進行逐一比較，如果兩者相應的信息段相同(航班號,目的地代碼)，就會判定貼有此條碼標簽的行李屬于該航班。數(shù)據(jù)流程如圖3所示。
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