變頻器控制方式特點:
其特點是控制電路結構簡單、成本較低,機械特性硬度也較好,能夠滿足一般傳動的平滑調速要求,已在產業的各個域得到廣泛應用。但是,這種控制方式在低頻時,由于輸出電壓較低,轉矩受定子電阻壓降的影響比較顯著,使輸出大轉矩減小。另外,其機械特性終究沒有直流電動機硬,動態轉矩能力和靜態調速性能都還不盡如人意,且系統性能不高、控制曲線會隨負載的變化而變化,轉矩響應慢、電機轉矩利用率不高,低速時因定子電阻和逆變器死區效應的存在而性能下降,穩定性變差等。因此人們又研究出矢量控制變頻調速。
S7-1200通信和程序的特點:
S7-1200是西門子的新一代的控制器,在串口通信方面在硬件與軟件方面都與S7-200不同:通訊方面:作為200的升產品,1200不支持DP等應用比較廣泛的通訊協議,但保留了強大的自由口通訊功能;程序方面:引入塊概念,更接近于300,編程方便,尤其是通訊方面的編程(自由口、MODBUS等,一個塊可以控制多個驅動器,不同電機的數據存儲在不同的數據庫中;硬件方面:S7-1200現有的幾款PLC都可以擴展3個串口通信模板(即可以全部是RS232接口,也可以全部是RS485接口,也可以是兩種接口的組合),而S7-200這不可以進行擴展,只能用本體上的RS485口,在這一點上功能強了。軟件方面:S7-1200,在編程上與S7-300的編程方法類似,組態完硬件接口,直接調用功能塊就可以,非常簡單,不像S7-200需要對SM進行操作。S7-1200與S7-300在串口通信比較起來基本上一樣,但在作Modbus的通信時不需要額外的Dongle來支持。
140DDI15310 Modicon DC In 4x8 140-DDI-153-10
140DAO85300 Used TESTED Modicon Quan AC OUT 140-DAO-853-00
140DAO85300 NEW SEALED Modicon Quan AC OUT 140-DAO-853-00
140DAO85300 NEW Modicon Quan AC OUT 140-DAO-853-00
140DAO85300 Modicon Quan AC OUT 140-DAO-853-00
140DAO84220 Used TESTED Modicon AC Out 140-DAO-842-20
140DAO84220 New Modicon AC Out Module 140-DAO-842-20
140DAO84210 Used Modicon Quan AC OUT 100 140-DAO-842-10
140DAO84210 New SEALED! Modicon Quan AC OUT 100 140-DAO-842-10
140DAO84210 SEALED Modicon Quan AC OUT 100 140-DAO-842-10
140DAO84000 Used Modicon Quan AC OUT 100 140-DAO-840-00
140DAO84000 New Modicon Quan AC OUT 100 140-DAO-840-00
140DAO84000 Sealed! Modicon Quan AC OUT 100 140-DAO-840-00
140DAM59000 USED Excellent/Guaranteed Modicon Quantum AC IN 140-DAM-590-00
140DAM59000 NEW SEALED Guaranteed Modicon Quantum AC IN 140-DAM-590-00
140DAI75300 TESTED Used Modicon AC Input 140-DAI-753-00
140DAI74000 TESTED Used Modicon AC Input 140-DAI-740-00
140DAI55300 Used Excellent Modicon Quantum AC IN 140-DAI-553-00
140DAI55300 FACTORY SEALED Modicon Quantum AC IN 140-DAI-553-00
140DAI54300 NEW SEALED Modicon Quantum AC IN 140-DAI-543-00
140DAI54300 NEW Modicon Quantum AC IN 140-DAI-543-00
140DAI54300 New Factory Sealed Modicon Quantum AC IN 140-DAI-543-00
140DAI54000 Used Modicon Quantum AC IN 140-DAI-540-00
140DAI54000 NEW Modicon Quantum AC IN 140-DAI-540-00
140DAI54000 Modicon Quantum AC IN 140-DAI-540-00
140DAI35300 Used Modicon Quantum AC IN 140-DAI-353-00
140DAI35300 ! Modicon Quantum AC IN 140-DAI-353-00
140CRP93200 Used TESTED Modicon RIO HEAD Module 140-CRP-932-00
140CRP93200 NEW Modicon RIO HEAD Module 140-CRP-932-00
140CRP93200 FACTORY NEW SEALED! Modicon RIO HEAD Module 140-CRP-932-00
140CRP93200 Modicon RIO HEAD Module 140-CRP-932-00
140CRP93100 Used Modicon RIO HEAD Module 140-CRP-931-00
140CRP93100 FACTORY SEALED! Modicon RIO HEAD Module 140-CRP-931-00
140CRP93100 FACTORY FRESH SEALED! Modicon RIO HEAD Module 140-CRP-931-00
140CRP81100 USED TESTED! Modicon Profibus DP Master 140-CRP-811-00
140CRP81100 Gebraucht Geprüft! Modicon Profibus Dp Master 140-CRP-811-00
140CRA93200C New Sealed Modicon RIO HEAD Module 140-CRA-932-00 140CRA93200
140CRA93200C Neu Verpackt Modicon Rio Kopf Modul 140-CRA-932-00 140CRA93200
140CRA93200 TESTED! Modicon Quantum RIO Drop 140-CRA-932-00
140CRA93200 Geprüft! Modicon Quantum Rio Tropfen 140-CRA-932-00
140CRA93200 FACTORY NEW SEALED! Modicon RIO HEAD Module 140-CRA-932-00
140CRA93200 FACTORY NEW Modicon RIO HEAD Module 140-CRA-932-00
140CRA93200 Fabrik Neu Verpackt! Modicon Rio Kopf Modul 140-CRA-932-00
140CRA93100 NEW SEALED Modicon Quantum RIO Drop 140-CRA-931-00
140CRA93100 NEW Modicon Quantum RIO Drop 140-CRA-931-00
140CRA93100 Modicon Quantum RIO Drop 140-CRA-931-00
140CRA31200 USED TESTED! Modicon Quantum 140-CRA-312-00
140CRA31200 NEW FACTORY SEALED! Modicon Quantum 140-CRA-312-00
140CRA31200 Gebraucht Geprüft! Modicon Quantum 140-CRA-312-00
140CRA31200 Brandneu Modicon Quantum 140-CRA-312-00
140CRA31200 Modicon Quantum 140-CRA-312-00
140CRA21210 Used Modicon DI/O Drop MB+ 140-CRA-212-10
140CRA21120 Used Modicon DI/O Drop MB+ 140-CRA-211-20