RM7890 質保一年
                  瀏覽次數:2
                  • 產品/服務:RM7890 質保一年
                  • 單價:666.00元/
                  • 發貨期限:自買家付款之日起天內發貨
                  • 更新日期:2020-11-16 有效期至:長期有效
                  • 聯系人:高怡 (先生)
                  • 公司電話:-
                  • 手機號碼:15359269934
                  • 即時通訊:  
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                  優勢品牌:AB 羅克韋爾、GE 通用電器、SCHNEIDER 施耐德、TRICONEX 、FOXBORO 福克斯波羅、SIEMENS 西門子、HONEYWELL 霍尼韋爾、ABB    出售目的:為客戶創造價值是咱們追求的方針    出售情緒:質量保證、誠信效勞、及時到位

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                  RM7890

                  RM7890

                  RM7890

                  (5)來自接地系統混亂時的干擾

                    接地是提高電子設備電磁兼容性(EMC)的有效手段之一。正確的接地,既能抑制電磁干擾的影響,又能抑制設備向外發出干擾;而錯誤的接地,反而會引入嚴重的干擾信號,使PLC系統將無法正常工作。PLC控制系統的地線包括系統地、屏蔽地、交流地和保護地等。接地系統混亂對PLC系統的干擾主要是各個接地點電位分布不均,不同接地點間存在地電位差,引起地環路電流,影響系統正常工作。例如電纜屏蔽層必須一點接地,如果電纜屏蔽層兩端A、B都接地,就存在地電位差,有電流流過屏蔽層,當發生異常狀態加雷擊時,地線電流將更大。

                    此外,屏蔽層、接地線和大地有可能構成閉合環路,在變化磁場的作用下,屏蔽層內有會出現感應電流,通過屏蔽層與芯線之間的耦合,干擾信號回路。若系統地與其它接地處理混亂,所產生的地環流可能在地線上產生不等電位分布,影響PLC內邏輯電路和模擬電路的正常工作。PLC工作的邏輯電壓干擾容限較低,邏輯地電位的分布干擾容易影響PLC的邏輯運算和數據存儲,造成數據混亂、程序跑飛或死機。模擬地電位的分布將導致測量精度下降,引起對信號測控的嚴重失真和誤動作。



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