
系統(tǒng)特點和組態(tài) 兩組PLC控制器互為冗余,雙機熱備軟件MaxON負責管理兩PLC之間的主、備切換以及數(shù)據(jù)的交換。正常情況下,主PLC控制器完成系統(tǒng)操作,一旦主PLC控制器失效,則備用PLC將立刻接管對整個系統(tǒng)的控制。主、備控制器的確定可以人為指定(%M1020),也可以由系統(tǒng)根據(jù)情況確定。 PLC與VersaMax進行通訊的Genius總線采用冗余結(jié)構(gòu)。正常情況下,系統(tǒng)從GeniusA總線獲取數(shù)據(jù),同時檢測GeniusB總線的狀態(tài),一旦系統(tǒng)檢測到GeniusA總線故障,則會對GeniusB總線存取數(shù)據(jù),從而保證了系統(tǒng)的安全運行。 GBC模塊可以自動報警及某些PLC故障。在一個總線掃描周期,只有一條診斷信息發(fā)送,設備保存其余的診斷信息直到下一個可獲得的總線掃描周期。GBC保存其接收到的任何診斷信息,該信息被CPU自動讀取,并在Versapro軟件的PLC故障表中顯示。 CPU的掃描既可以盡可能快的進行也可以被分配一個恒定的時間段。不管是否使用恒定的掃描時間,CPU的掃描總是從執(zhí)行邏輯程序及變更I/O開始,其余的時間用于通訊及后臺任務。 GE90-30系列PLC有兩種冗余方式,本套系統(tǒng)采用的是HBR冗余中的“HotStandby(熱備)”模式。 Maxon主要用于完成冗余系統(tǒng) (PLCA,PLCB)之間用戶數(shù)據(jù)范圍的定義、冗余變量的定義及冗余軟件與VersaPro之間的結(jié)合。由于Maxon1.5與 VersaPro2.02之間的版本兼容性問題,VersaPro的組態(tài)包括PLC硬件配置的組態(tài)及邏輯組態(tài)兩部分,由編程器執(zhí)行邏輯及配置信息的下裝。 I/O系統(tǒng)的硬件配置由編程器來完成。 通過編程器可設置NIU在Genius總線上的地址,所掛I/O模件的類型,每個通道的信號形式、范圍與通訊有關(guān)參數(shù)的設置等。通過專用接口線纜將編程器的COM口和每個I/O站的NIU接口連接,并將相應組態(tài)文件下裝
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