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產品簡介
3HAC021206-001
3HAC021206-001
產品價格:¥1200
上架日期:2016-11-08 09:22:03
產地:美國
發(fā)貨地:廈門
供應數(shù)量:不限
最少起訂:1塊
瀏覽量:10
資料下載:暫無資料下載
其他下載:暫無相關下載
詳細說明

    3HAC021206-0013HAC021206-0013HAC021206-001

     

      司  張工  Tel0592-5072116   18006003563

    Fax0592-5072083      商務QQ565167042

    目前市場上的PLC產品眾多,性價比越來越高,可選范圍越來越大,為此,我們在選購時應從下面幾個方面綜合考慮,合理選購PLC產品:

     二、輸入回路設計注意事項:

      2.1、 電源回路PLC供電電源一般為AC85-240V(也有DC24V),適應電源范圍較寬,但為了抗干擾,應加裝電源凈化元件(如電源濾波器 1: 1隔離變壓器等)。

      2.2、PLC上DC24V電源的使用 各公司PLC產品上一般都有 DC24V 電源,但該電源容量小,為幾十毫安至幾百毫安,用其帶負載時要注意容量,同時要有短路保護措施。

      2.3、 外部DC24V電源的使用 若輸入回路有 DC24V供電的接近開關 光電開關等,而PLC上DC24V電源容量不夠時,要從外部提供DC24V電源,但該電源的 - 端不要與PLC的DC24V的 - 端以及COM端相連,否則會影響PLC的運行。

      2.4、 輸入的靈敏度 當輸入電壓 電流小于各廠家對 PLC 的輸人端電壓和電流的規(guī)定,如當輸入回路串有二極管或電阻(不能完全啟動),或者有并聯(lián)電阻或有漏電流時(不能完全切斷),就會有誤動作,造成靈敏度下降,對此應采取措施。當輸入器件的輸入電流大于PLC的最大輸入電流時,也會引起誤動作,應采用弱電流的輸入器件,并且選用輸入為共漏型輸入的PLC。

      三、輸出回路設計注意事項:

      3.1、輸出方式選擇

      (1)繼電器輸出:優(yōu)點是不同公共點之間可帶不同的交直流負載,且電壓也可不同,帶負載電流可達2A 點;但繼電器輸出方式不適用于高頻動作的負載,這是由繼電器的壽命決定的 (2)晶閘管輸出:帶負載能力為0.2A/ 點,只能帶交流負載,可適應高頻動作,響應時間為 1ms (3)晶體管輸出:最大優(yōu)點是適應于高頻動作,響應時間短,一般為0.2ms左右,但它只能帶DC5-30V的負載,最大輸出負載電流為0.5A/點,但每4點不得大于0.8A。當你的系統(tǒng)輸出頻率為每分鐘 6 次以下時,應首選繼電器輸出,因其電路設計簡單,抗干擾和帶負載能力強 當頻率為 10 次/min 以下時,既可采用繼電器輸出方式,也可采用PLC輸出驅動達林頓三極管(5-10A),再驅動負載。


     


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