變頻器控制方式特點：
其特點是控制電路結(jié)構(gòu)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(zhuǎn)矩受定子電阻壓降的影響比較顯著，使輸出大轉(zhuǎn)矩減小。另外，其機械特性終究沒有直流電動機硬，動態(tài)轉(zhuǎn)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(zhuǎn)矩響應慢、電機轉(zhuǎn)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(qū)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。
Set Of 2 OMRON CYLINDRICAL PHOTO EYE SENDER E3F-3LZ, SHIPSAMEDAY#1172Q6
SERTO Male adaptor union, SOL 51124-10-1/4, 078.1171.270, LOT OF 6#1224R10
Sermix Rorze RC-201 Count Controller, TA2644, No Box, Shipsameday #ZG20
Sensotec Pressure Transducer 5000 Psig, TJE/743-06, TJE74306, ShipSameDay Z#41
SENSOTEC A10/7042-01, PRESSURE TRANSDUCER 1/4" NPT, 50 PSIA, SHIPSAMEDAY
Sensorex Electrode S220C, SHIPSAMEDAY #1606K
Senso-Metrics Pressure Transducer SP70A, 10KG, Shipsameday #1541Z6
Senso-Metrics Pressure Transducer 601765, 10KPSI, Shipsameday #1327Z
SEMIKRON SKiiP 942GB120-317CTV-F, Good For Part, SHIPSAMEADAY
SEMIKRON MODULE SKKD 170M19, SKKD17M19, 9644, Semipack, SHIPSAMEDAY #107D
SEMIFLOW Mass Flow Controller 1/4" COMP, N2, 14 SLPM, SFC2010, # BOX 7
Semi Gas Regulator 1/4" VCR, 0330075100, 033 0075 100, SHIPSAMEDAY#170P2
SEMI GAS Quarter turn valve 1/4" VCR X 1/4" FVCR, 032-0375, LOT OF 2 #1605V6
Selco Controller 6006W, CSS228, PFA358 C3560 Collaudo 430, Shipsameday#1214L
SEAL O-RING 223/70 VITON ROUND BRN FDA, LOT OF 250, SHIPSAMEDAY
Seal Master Bearing 5210, Shipsameday W/2-3 Days Shipping #1638V
SDP/SI Metal Spur Gear, S1066Z-048S084, LOT OF 4, SHIPSAMEDAY#123F11
SCV DIAPHRAGM VALVE SEAT PCTFE, TD4CS-GC, TD4CSGC, SHIPSAMEDAY#1224Q9
SCM CDQSD2050DCM9NL, CDQSD20-50DC-M9NL, D-M9N, Shipsameday #1177y
SCM CDQ2B32-50DCM-M9NL, CDQ2B3250DCMM9NL, D-M9N, Shipsameday #1177X
Schunk INK 40/S, 0301555, 00099420, Shipsameday W/2-3dayshipping #117C
Schunk 40010926, MMSK 22-S-PNP-SA, 0301044, MMSK22-S-PNP-SA, Shipsameday#1538B
Schunk 0301506, INW65/S-M12, 845896, ShipSameDay W2-3days Shipping#1614G
Schrader Bellows 697318009, 69731-8009, Ship Same Day W/2-3 Days Shipping #1639Z
Schneider Electric Contactor LC1, 3-P, 50 A, 24V, LC1D326B7, SHIPSAMEDAY#141K2
SCHNEIDER Contactor, 24V, 3 Pole, LC1D32BD, TESYS-035725, SHIPSAMEDAY#1621P9
Schneider 24116, Multi 9 C60, 24116DA, 1P-B10A, Shipsameday #115B2
Schneider 17404, Multi 9 C60, 17404DA, 1P-B5A, Shipsameday #115B3
Schmersal Monitoring Of BNS Range Magnetic, AES1235D, 24V, Shipsameday#114A4
Scheider Circuit breaker 60179, 3 pole, 15 amp, 240V, 6415361, Shipsameday #146C
Scheider Circuit breaker 60150, 2 pole, 35 amp, 125/240V, 6415375, #146D
Scheider Circuit breaker 60147, 2P, 20A, 125/240V, 6415362, Shipsameday#146E
SCHAFFNER FN 660-6/06, 660-6/06, LINE FILTER 250VAC 6A, LOT OF 4, SHIPSAMEDAY
SCHAFFNER FN 660-16/60, 660-16/60, 66016/60, LINE FILTER , LOT OF 3, SHIPSAMEDAY
SANYU RELAY REED, USM-13924SB, SHIPSAMEDAY#1550F4
Samtec TSW-150-07-G-D, TSW15007GD, Header 100 Pos .100" DL Gold, Lot Of 15 #169C
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Samtec TSM-102-01-L-SV-P-TR, CONN HEADER SMD 2POS 2.54MM LOT OF 125, SHIPSAMEDAY
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Samtec SSQ-108-02-S-D, SSD10802SD, Conn RCPT 16 Pos, DL, R/A, Lot Of 22 #169B
Samtec QTE-040-01-F-D-A-GP, QTE04001FDAGP, Lot Of 20, F#37
Samtec HTST-105-01-L-DV, CONN HEADER SMD 10POS 2.54MM, LOT OF 53, SHIPSAMEDAY
Samtec Conn Socket Strip Skt 50pos, 1.27mm, SFM-125-T1-F-D, Lot Of 32, H#11
Samtec Conn Socket Strip Skt 26pos, CLP-113-02-F-DH, CLP11302FD, Lot Of 25, H#12
Samtec CONN HEADER SMD 20POS, TFM-110-02-L-D-WT, LOT OF 40, SHIPSAMEDAY
Samsung LEGS LEFT & RIGHT, BN96-50860A & BN96-50862A, SHIPSAMEDAY
SAMSUNG LCD DISPLAY UC-16202-GNARO-M, UC-16202GNAROM, LCM7621-N1AB0, LOT
Samsung CAP CER 10UF 25V X7R, CL31B106KAHNNNE, LOT OF 2000, SHIPSAMEDAY
SAMSON 6113-011210.00, 6113011210.00, I/P-CONVERTER, SHIPSAMEDAY #1636F
Sam-Flow 1-1/2" Socket Weld Ball Valve 1000 WOG, CF8M, SHIPSAMEDAY#1375B1
