IC200TBM002，IC200TBM002，IC200TBM002
AB 大型PLC在行李自動分揀系統中的應用
行李分揀系統（BHS）控制離港和到港兩部分系統設備，,采用信息網、控制網和遠程I/O鏈路三級控制結構。兩臺離港上位控制機采用WINDOWS NT4.0操作系統和INTOUCH 7.0工業組態軟件，互為熱備，配置雙網卡，除與機場計算機集成系統（SI）以及計算機離港控制系統（DCS）構成以太網外，還與下位主控制器PLC構成以太網。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據處理能力。系統結構如圖1所示。
2.2 自動分揀原理
行李自動分揀系統（BHS）必須和機場計算機集成系統（SI）以及計算機離港控制系統（DCS）進行實時的數據交換，并把獲得的數據發送給下位PLC-5/80進行處理。網絡拓撲結構如圖2。
PLC-5/80必須獲取以下三種數據信息：
A． 航班信息。此信息由行李分揀系統上位機從機場計算機集成系統的航班數據庫讀取，并轉發給下位PLC。航班信息包含的內容有：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，發送到機場計算機離港系統，然后通過行李分揀系統的報文接口機發送給行李分揀上位控制機，上位控制機將報文通過內部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 。
要實現自動分揀，PLC必須對得到的數據信息進行兩次比較。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。數據流程如圖3所示。
AB Ethernet & RS 232
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