圖1-4 Tricon 主機(jī)架背板
圖中：①雙重電源軌 ②電源端子條 ③#1電源 ④#2電源 ⑤I/O終端用ELCO接頭 ⑥公共總線 ⑦I/O總線 ⑧主處理器A、B、C ⑨左I/O 模塊左I/O 模塊 標(biāo)準(zhǔn)邏輯槽口 ⑩通訊模塊 ○11左模塊和右模塊在任一特定時(shí)間內(nèi)都互為備用
每個(gè)I/O 模塊通過其對應(yīng)的端子板接收現(xiàn)場信號或向現(xiàn)場傳送數(shù)據(jù)。234271-10388-A06機(jī)架相鄰的物理槽位視作同一個(gè)邏輯槽位。第一個(gè)位置上放置工作模塊，第二位置放置熱備I/O模塊。端子板通過背板頂部的Elco插頭相連，同時(shí)連接工作和熱備的I/O模塊。所以，這兩個(gè)模塊接收的是相同的來自端子板的信號。
I/O總線可使信息在I/O模塊和主處理器之間傳送，速率為375K波特。三重化I/O總線沿著背板的底部敷設(shè)。I/O總線的每一分234271-10388-A06電路在一個(gè)主處理器與其相應(yīng)的I/O模塊上的相應(yīng)的分電路間傳遞信息。I/O總線通過一組三條I/O總線纜在各機(jī)架間的延伸。
通訊總線在主處理器和通訊模塊之間傳輸信息，其速率為2 M波特。對機(jī)架的電力被分配在兩個(gè)獨(dú)立的電源軌上，并分給背板的中心。機(jī)架上的各個(gè)模塊從兩條電源軌上通過雙重電源調(diào)節(jié)器同時(shí)吸取電力。每一塊輸入輸出板上有四組電源調(diào)節(jié)器：一組對應(yīng)一個(gè)支路（A、B和C），剩下一組用于狀態(tài)指示燈。
1.3.3 234271-10388-A06數(shù)字輸入模塊
Tricon提供兩種基本類型的數(shù)字輸入模塊：TMR和簡易型。在TMR模塊上，全部關(guān)鍵的信道都被100%地三重化，以保證安全性和最大的利用率。在簡易型模塊上，只有那些保證安全運(yùn)行所需的信號通路部分才被三重化。簡易型模塊用于低成本比最大利用率更重要的關(guān)鍵安全場合。
1.3.3.1 TMR數(shù)字輸入模塊
每個(gè)數(shù)字輸入模塊內(nèi)有三個(gè)相同的分電路（A、B、C）。雖然三個(gè)分電路都裝在同一模塊內(nèi)，但它們是完全相互隔離的，并獨(dú)立運(yùn)行。每個(gè)分電路可獨(dú)立地對信號進(jìn)行處理并在現(xiàn)場和Tricon之
間采用光電隔離。（#3504E型64點(diǎn)高密度數(shù)字輸入模塊是一個(gè)例外，它沒有隔離。）一條分電路上的故障就不會擴(kuò)散到另外的分電路。此外，每條支路含有一個(gè)8位微處理器（IOP），它處理與其相應(yīng)的主處理器的通訊。
三個(gè)輸入分電路的每一個(gè)分電路可異步地檢查輸入端子板上的每點(diǎn)信號，以判別其狀態(tài)并將值放在相應(yīng)的A、B、C輸入表內(nèi)。234271-10388-A06每個(gè)輸入表都定期地經(jīng)過I/O總線由位于相應(yīng)的主處理器模塊上的I/O通訊處理器進(jìn)行詢問。例如，主處理A通過I/O總線A詢問輸入表A。
234271-10388-A06帶自測試的直流數(shù)字輸入模塊，能夠檢測“ON粘住”（指模塊測量回路無法檢測到現(xiàn)場信號斷開）的狀態(tài)，這對安全系統(tǒng)是一個(gè)重要的特征。因?yàn)榻^大數(shù)安全系統(tǒng)都是“去磁跳閘”。為了測試“STUCK ON”現(xiàn)象，通過輸入一個(gè)閉合信號（輸入電路中的一個(gè)開關(guān)），使光電隔離電路能讀取零值輸入值，以此來檢測“ON 粘住”狀態(tài)。在測試期間，上一次讀取的數(shù)據(jù)（數(shù)據(jù)OFF），凍結(jié)在IOP內(nèi)（I/O通訊處理器內(nèi)）。
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