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(diào)速要求，已在產(chǎn)業(yè)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(tài)轉矩能力和靜態(tài)調(diào)速性能都還不盡如人意，且系統(tǒng)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(qū)效應的存在而性能下降，穩(wěn)定性變差等。因此人們又研究出矢量控制變頻調(diào)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(chǎn)品，1200不支持DP等應用比較廣泛的通訊協(xié)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(shù)據(jù)存儲在不同的數(shù)據(jù)庫中；硬件方面：S7-1200現(xiàn)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(tài)完硬件接口，直接調(diào)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。
BMXNOE0100 FACTORY SEALED Schneider Electric Modicon BMX-NOE-0100
BMXNOC0401 Used Schneider Electric Modicon M340 BMX-NOC-0401
BMXNOC0401 Used Schneider Electric Modicon M340 BMX-NOC-0401
BMXNOC0401 used Schneider Electric Modicon M340 BMX-NOC-0401
BMXNOC0401 Brandneu Schneider Electric Modicon M340 BMX-NOC-0401
BMXNOC0401 Schneider Electric Modicon M340 BMX-NOC-0401
BMXFTW501 ! MODICON M340 BMX-FTW-501 5M Cable
BMXFTW301S ! MODICON M340 BMX-FTW-301S 3M Cable
BMXFTB2800 M340 Spring Terminal Strip BMX-FTB-2800
BMXFCW503 MODICON M340 BMX-FCW-503 Cable
BMXFCW303 Excellent MODICON M340 BMX-FCW-303 3M Cable
BMXFCW303 Brandneu! Modicon M340 BMX-FCW-303 Kabel
BMXFCW303 ! MODICON M340 BMX-FCW-303 Cable
BMXFCW301 ! MODICON M340 BMX-FCW-301 Cable
BMXFCC101 Used MODICON M340 BMX-FCC-101 CONNECTING CABLE
BMXFCC101 ! MODICON M340 BMX-FCC-101 Cable
BMXFCC053 Used MODICON M340 BMX-FCC-053 CONNECTING CABLE
BMXFCA150 Used MODICON M340 BMX-FCA-150 CONNECTING CABLE
BMXFCA150 ! MODICON M340 BMX-FCA-150 CONNECTING CABLE
BMXEHC0800 Excellent Schneider Electric Modicon BMX-EHC-0800 M340
BMXEHC0200 Electric Modicon BMX-EHC-0200 M340
BMXDRA1605 USED EXCELLENT Schneider Electric Modicon BMX-DRA-1605
BMXDRA1605 Brandneu Schneider Electric Modicon BMX-DRA-1605
BMXDRA1605 Schneider Electric Modicon BMX-DRA-1605
BMXDRA0805H Schneider Electric Modicon BMX-DRA-0805H
BMXDRA0805 Schneider Electric Modicon BMX-DRA-0805
BMXDDO6402K Used Schneider Electric Modicon BMX-DDO-6402K
BMXDDO6402K Schneider Electric Modicon BMX-DDO-6402K
BMXDDO3202K Excellent Schneider Electric Modicon BMX-DDO-3202K M340
BMXDDO3202K Schneider Electric Modicon BMX-DDO-3202K
BMXDDO1602 Used Schneider Electric Modicon BMX-DDO-1602
BMXDDO1602 New Schneider Electric Modicon BMX-DDO-1602 M340
BMXDDO1602 Schneider Electric Modicon BMX-DDO-1602
BMXDDM16025 Used Schneider Electric Modicon BMX-DDM-16025
BMXDDM16022 Used Schneider Electric Modicon BMX-DDM-16022
BMXDDI6402K Used Tested Schneider Electric Modicon BMX-DDI-6402K M340
BMXDDI6402K Brandneu Schneider Electric Modicon BMX-DDI-6402K
BMXDDI6402K Schneider Electric Modicon BMX-DDI-6402K
BMXDDI3202K USED Schneider Electric Modicon BMX-DDI-3202K
BMXDDI1603 Used Schneider Electric Modicon BMX-DDI-1603
BMXDDI1602 Used Schneider Electric Modicon BMX-DDI-1602
BMXDDI1602 Schneider Electric Modicon BMX-DDI-1602
BMXDAO1605 Schneider Electric Modicon BMX-DAO-1605
BMXDAI1604 Used Tested Schneider Electric Modicon BMX-DAI-1604
BMXDAI1604 Schneider Electric Modicon BMX-DAI-1604
BMXCRA31210 Schneider Electric Modicon BMX-CRA-31210 M340
BMXCRA31200 Brandneu Schneider Electric Modicon BMX-CRA-31200 M340 X80
BMXCRA31200 Schneider Electric Modicon BMX-CRA-31200 M340 X80
BMXCPS3500 Used Tested Schneider Electric Modicon BMX-CPS-3500
BMXCPS3500 New Schneider Electric Modicon BMX-CPS-3500 M340
BMXCPS3020H Excellent Tested Schneider Electric Modicon BMX-CPS-3020H
BMXCPS3020H Excellent Checked Schneider Electric Modicon BMX-CPS-3020H
BMXCPS3020 Excellent Tested Schneider Electric Modicon BMX-CPS-3020
