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現(xiàn)貨 TRICONEX 3511 Foxboro 控制處理器 CP40B 卡件 價
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4．分配IO點，編制出輸入輸出端子的接線圖。
5．設計應用系統(tǒng)梯形圖程序，這一步是整個應用系統(tǒng)設計核心的工作。
6．將程序輸入PLC，當使用計算機上編程時，可將程序下載到PLC中。
7．進行軟件測試，在將PLC連接到現(xiàn)場設備上之前，必須進行軟件測試，以排除程序中的錯誤。
8．應用系統(tǒng)整體調試，在PLC軟硬件設計和控制柜及現(xiàn)場施工完成后，就可以進行整個系統(tǒng)的聯(lián)機調試。調試中發(fā)現(xiàn)的問題要逐一排除，直至調試成功。
9．編制技術文件， 系統(tǒng)技術文件包括功能說明書、電氣原理圖、電器布置圖、電氣元件明細表、PLC梯形圖等。
PLC選型
在滿足控制要求的前提下，選型時應選擇的性能價格比，具體應考慮以下幾點。
1．性能與任務相適應
2．PLC的處理速度應滿足實時控制的要求
3．PLC應用系統(tǒng)結構合理、機型系列應統(tǒng)一
4．在線編程和離線編程的選擇
PLC容量估算
PLC容量包括兩個方面：一是IO的點數(shù)，二是用戶存儲器的 容量。
1．IO點數(shù)的估算
根據(jù)功能說明書，可統(tǒng)計出PLC系統(tǒng)的開關量IO點數(shù)及模擬量IO通道數(shù)，以及開關量和模擬量的信號類型。應在統(tǒng)計后得出IO總點數(shù)的基礎上，增加10％～15％的裕量。選定的PLC機型的IO能力極限值必須大于IO點數(shù)估算值，并應盡量避免使PLC能力接近飽和，一般應留有30％左右的裕量。
2. 存儲器容量估算
用戶應用程序占用多少內存與許多因素有關，如IO點數(shù)、控制要求、運算處理量、程序結構等。因此在程序設計之前只能粗略的估算。根據(jù)經驗，每個IO點及有關功能器件占用的內存大致如下：
所需存儲器容量(KB)＝(1～1.25)×(DI×10＋DO×8＋AIO×100＋CP×300)1024
其中：DI為數(shù)字量輸入總點數(shù)；DO為數(shù)字量輸出總點數(shù)；AIAO為模擬量IO通道總數(shù)；CP為通信接口總數(shù)。
IO模塊的選擇
1．開關量輸入模塊的選擇
PLC的輸入模塊用來檢測來自現(xiàn)場(如按鈕、行程開關、溫控開關、壓力開關等)電平信號，并將其轉換為PLC內部的低電平信號。開關量輸入模塊按輸

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XYCOM 9450-0343312010000