1746-OAP12

1746-OAP12

1746-OAP12

控制站軟件組態(tài)：
控制站的組態(tài)用OMRON的系統(tǒng)軟件SSS作為技術(shù)平臺(tái)，用梯形圖作為編程工具，其組態(tài)內(nèi)容主要有：
    2.4.1.PLC內(nèi)部地址的分配：
    I/O 地址的分配：PLC的I/O地址是PLC與現(xiàn)場(chǎng)檢測(cè)設(shè)備、執(zhí)行機(jī)構(gòu)進(jìn)行數(shù)據(jù)通信的唯一的一一對(duì)應(yīng)的寄存器地址，I/O地址的分配是對(duì)PLC進(jìn)行進(jìn)一步組態(tài)的基礎(chǔ)；對(duì)OMRON-C200而言，I/O地址與所連接的I/O模塊有關(guān)；連接到數(shù)字模塊上的現(xiàn)場(chǎng)設(shè)備，其I/O地址取決于I/O模塊的安裝位置和在該模塊上的點(diǎn)號(hào)，連接到模擬模塊、PID模塊上的現(xiàn)場(chǎng)設(shè)備，其I/O地址取決于I/O模塊的單元號(hào)（不同的模塊應(yīng)通過模塊的硬開關(guān)設(shè)置不同的單元號(hào)）和在該模塊上的點(diǎn)號(hào)；比如在本系統(tǒng)配置中，現(xiàn)場(chǎng)的雷達(dá)液位變送器LT-101輸出的4~20mA 的模擬信號(hào)連接在單元號(hào)為3的模擬輸入模塊AD003的第二點(diǎn)上，則它在PLC中的配置的地址便是IR：132；而閥門HV120的關(guān)閉狀態(tài)信號(hào)（closed）連接到安裝在的擴(kuò)展機(jī)架第二槽的數(shù)字輸入模塊ID212的第十點(diǎn)上，則它在PLC中的配置的地址便是IR：01210；本系統(tǒng)中，共定義 I/O地址142點(diǎn)。
    操作站與控制站數(shù)據(jù)交換地址的分配：操作站與控制站的數(shù)據(jù)通信是通過讀寫PLC的內(nèi)部寄存器來(lái)完成的，為了實(shí)現(xiàn)操作站與控制站的實(shí)時(shí)通訊，還必須為PLC配置足夠的內(nèi)部寄存器地址來(lái)存貯這些數(shù)據(jù)；比如，定義DM0232作為操作站與控制站交換LT－101的數(shù)據(jù)的內(nèi)部寄存器，則PLC把采集到LT－101的液位信號(hào)經(jīng)過預(yù)處理后存貯在DMO232，而操作站則到PLC的DM0232讀取LT－101的數(shù)據(jù)來(lái)建立自己的數(shù)據(jù)庫(kù)；本系統(tǒng)中，共定義此類地址184點(diǎn)。
    中間地址的分配：PLC在運(yùn)行過程中，還需要大量的中間寄存器來(lái)存放那些運(yùn)算過程中的臨時(shí)數(shù)據(jù)，為提高應(yīng)用程序的可讀性，也必須對(duì)這些寄存器進(jìn)行必要的定義和注釋。

   2.4.2.為控制策略編寫梯形圖
    自動(dòng)調(diào)節(jié)：本系統(tǒng)中選用3個(gè)PID03模塊組成6個(gè)調(diào)節(jié)回路來(lái)完成生產(chǎn)過程的自動(dòng)控制，為了方便操作人員在操作站對(duì)控制過程的管理，PID03的SW2應(yīng)設(shè)置為ON，并編寫相應(yīng)梯形圖以實(shí)現(xiàn)PLC與PID03的數(shù)據(jù)交換，比如：調(diào)節(jié)回爐PIC111由單元號(hào)為5的PID03的第二回路完成，當(dāng)執(zhí)行圖2所示一段程序后，PLC中地址DM0060中的數(shù)據(jù)就被定義為調(diào)節(jié)回路PIC111的給定值。（完整梯形圖略）

    三取二表決：為保證安全生產(chǎn)，常壓罐的壓力必須控制在規(guī)定的范圍內(nèi)，每升高（降低）到一定范圍時(shí)，就必須啟動(dòng)（停止）相應(yīng)的設(shè)備；為此，在現(xiàn)場(chǎng)用三塊壓力表來(lái)測(cè)量其壓力，PLC中對(duì)三個(gè)壓力進(jìn)行比較，只有三塊中的二塊同時(shí)具備條件時(shí)，連鎖才動(dòng)作；在編寫梯形圖時(shí)，采用比較指令、再加上與、或、非等邏輯指令就可實(shí)現(xiàn)此控制策略。（梯形圖略）
連鎖保護(hù)：梯形圖與電氣連鎖邏輯圖非常相似，I/O地址確定以后，為連鎖保護(hù)編寫梯形圖既操作簡(jiǎn)單又可讀性強(qiáng)。為保護(hù)設(shè)備和生產(chǎn)安全，本系統(tǒng)共編寫連鎖回路21個(gè)。（梯形圖略）

2.4.3.I/O模塊的設(shè)置與校正：
    梯形圖編寫完成以后，還必須對(duì)I/O模塊進(jìn)行必要的設(shè)置和校正，PLC才能正常工作；模擬模塊應(yīng)設(shè)置與現(xiàn)場(chǎng)設(shè)備相對(duì)應(yīng)的輸入信號(hào)種類和對(duì)輸入信號(hào)的預(yù)處理方法，還應(yīng)對(duì)零點(diǎn)和量程進(jìn)行校正；PID模塊除了對(duì)輸入信號(hào)種類、輸入信號(hào)的預(yù)處理方法進(jìn)行設(shè)置外，還要對(duì)PID模塊存儲(chǔ)區(qū)的內(nèi)容及其修改方式、調(diào)節(jié)回路設(shè)定值的修改方式、PID的控制作用及其控制方式等內(nèi)容進(jìn)行設(shè)置。

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Honeywell 3-Way Pneumatic Control Valve P/N 30673738-001 5" 125# Flange

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Magnetrol Liquid Level Control Cat #A15-1H2A-AKY 120/240V 4" 125# Flange

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