FOXBORO 3C4-D2CP

FOXBORO 3C4-D2CP

對存儲容量的選擇

對用戶存儲容量只能作粗略的估算。在僅對開關量進行控制的系統中，可以用輸入總點數乘 10 字 / 點＋輸出總點數乘 5 字 / 點來估算；計數器/ 定時器按（ 3 ～ 5 ）字 / 個估算；有運算處理時按（ 5 ～ 10 ）字 / 量估算；在有模擬量輸入 / 輸出的系統中，可以按每輸入 / （或輸出）一路模擬量約需（ 80 ～ 100 ）字左右的存儲容量來估算；有通信處理時按每個接口 200 字以上的數量粗略估算。zui后，一般按估算容量的50 ～ 100 ％留有裕量。對缺乏經驗的設計者，選擇容量時留有裕量要大些。

（ 3 ）對 I/O 響應時間的選擇

PLC 的 I/O 響應時間包括輸入電路延遲、輸出電路延遲和掃描工作方式引起的時間延遲（一般在 2 ～ 3 個掃描周期）等。對開關量控制的系統，PLC 和 I/O 響應時間一般都能滿足實際工程的要求，可不必考慮 I/O 響應問題。但對模擬量控制的系統、特別是閉環系統就要考慮這個問題。

（ 4 ）根據輸出負載的特點選型

不同的負載對 PLC 的輸出方式有相應的要求。例如，頻繁通斷的感性負載，應選擇晶體管或晶閘管輸出型的，而不應選用繼電器輸出型的。但繼電器輸出型的 PLC 有許多優點，如導通壓降小，有隔離作用，價格相對較便宜，承受瞬時過電壓和過電流的能力較強，其負載電壓靈活（可交流、可直流）且電壓等級范圍大等。所以動作不頻繁的交、直流負載可以選擇繼電器輸出型的 PLC 。

（ 5 ）對在線和離線編程的選擇

離線編程示指主機和編程器共用一個 CPU ，通過編程器的方式選擇開關來選擇 PLC 的編程、監控和運行工作狀態。編程狀態時， CPU 只為編程器服務，而不對現場進行控制。編程器編程屬于這種情況。在線編程是指主機和編程器各有一個 CPU ，主機的 CPU 完成對現場的控制，在每一個掃描周期末尾與編程器通信，編程器把修改的程序發給主機，在下一個掃描周期主機將按新的程序對現場進行控制。計算機輔助編程既能實現離線編程，也能實現在線編程。在線編程需購置計算機，并配置編程軟件。采用哪種編程方法應根據需要決定。

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