| 品牌：施耐德 | 規格：140CRA21110 | 材質：140CRA21110 |
| 產地：美國 |
140CRA21110
140CRA21110
140CRA21110
從控制速度上看，繼電器控制係統依靠機械觸點的動作以實現控制，工作頻率低，機械觸點還會出現抖動問題。而PLC通過程序指令控制半導體電路來實現控制的，速度快， 程序指令執行時間在微秒級，且不會出現觸點抖動問題。
從定時和計數控制上看，電器控制係統採用時間繼電器的延時動作進行時間控制，時間繼電器的延時時間易受環境溫度和溫度變化的影響，定時精度不高。而PLC採用半導體集成電路作定時器，時鐘脈衝由晶體振蕩器產生，精度高，定時範圍寬，用戶可根據需要在程序中設定定時值，修改方便，不受環境的影響，且PLC具有計數功能，而電器控制係統一般不具備計數功能。
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