PLC的輸出點可分為共點式、分組式和隔離式幾種接法。隔離式的各組輸出點之間可以采用不同的電壓種類和電壓等級，但這種PLC平均每點的價格較高。如果輸出信號之間不需要隔離，則應選擇前兩種輸出方式的PLC。?
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(tǒng)中，可以用輸入總點數(shù)乘10字/點+輸出總點數(shù)乘5字/點來估算;計數(shù)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(tǒng)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(shù)量粗略估算。最后，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。?
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(tǒng)，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(tǒng)、特別是閉環(huán)系統(tǒng)就要考慮這個問題。 【價格】 ? 如此低價，僅此一家
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