| 品牌：施耐德 | 規格：140DRC83000 | 材質：140DRC83000 |
| 產地：法國 |
140DRC83000
140DRC83000
140DRC83000
當PLC的輸入端輸入信號發生變化PLC輸出端對該輸入變化做出反應需要一段時間，這種現象稱為PLC輸入/輸出響應滯後。
由上述分析可知，掃描周期的長短主要取決於程序的長短。掃描周期越長，響應速度越慢。由於每一個掃描周期只進行一次I/O刷新，即每一個掃描周期PLC只對輸人、輸出狀態寄存器更新一次，故使係統存在輸人、輸出滯後現象，這在程度上降低了係統的響應速度。工業現場的幹擾常常是脈衝式的、短時的，PLC的輸入/輸出響應滯後，對一般的工業控制要求，是完全允許的，還可以起到增強係統的抗幹擾能力。
但是，對於控制時間要求嚴格、響應速度要求較快的係統，就要採取措施減小輸入/輸出滯後的不利影響。
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