621-1101R 廈門優勢現貨
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                  • 產品/服務:621-1101R 廈門優勢現貨
                  • 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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                  621-1101R

                  621-1101R

                  621-1101R

                  3.PLC控制系統中電磁干擾的主要來源有哪些呢?

                    (1)來自空間的輻射干擾

                    空間的輻射電磁場(EMI)主要是由電力網絡、電氣設備的暫態過程、雷電、無線電廣播、電視、雷達、高頻感應加熱設備等產生的,通常稱為輻射干擾,其分布極為復雜。若PLC系統置于所射頻場內,就回收到輻射干擾,其影響主要通過兩條路徑;一是直接對PLC內部的輻射,由電路感應產生干擾;而是對PLC通信內網絡的輻射,由通信線路的感應引入干擾。輻射干擾與現場設備布置及設備所產生的電磁場大小,特別是頻率有關,一般通過設置屏蔽電纜和PLC局部屏蔽及高壓泄放元件進行保護。

                    (2)來自系統外引線的干擾

                    主要通過電源和信號線引入,通常稱為傳導干擾。這種干擾在我國工業現場較嚴重。

                    (3)來自電源的干擾

                    實踐證明,因電源引入的干擾造成PLC控制系統故障的情況很多,筆者在某工程調試中遇到過,后更換隔離性能更高的PLC電源,問題才得到解決。

                    PLC系統的正常供電電源均由電網供電。由于電網覆蓋范圍廣,將受到所有空間電磁干擾而在線路上感應電壓和電路。尤其是電網內部的變化,入開關操作浪涌、大型電力設備起停、交直流轉動裝置引起的諧波、電網短路暫態沖擊等,都通過輸電線路到電源邊。PLC電源通常采用隔離電源,但其機構及制造工藝因素使其隔離性并不理想。實際上,由于分布參數特別是分布電容的存在,隔離是不可能的。

                    (4)來自信號線引入的干擾

                    與PLC控制系統連接的各類信號傳輸線,除了傳輸有效的各類信號之外,總會有外部干擾信號侵入。此干擾主要有兩種途徑:一是通過變送器或共用信號儀表的供電電源串入的電網干擾,這往往被忽略;二是信號線受空間電磁輻射感應的干擾,即信號線上的外部感應干擾,這是很嚴重的。由信號引入干擾會引起I/O信號工作異常和測量精度大大降低,嚴重時將引起元器件損傷。對于隔離性能差的系統,還將導致信號間互相干擾,引起共地系統總線回流,造成邏輯數據變化、誤動和死機。PLC控制系統因信號引入干擾造成I/O模件損壞數相當嚴重,由此引起系統故障的情況也很多。



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