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。
Phoenix Contact TERMINAL CONNECTOR SET, 2727912, IBSIPDLPLSET, SHIPsameday#1553Q
Phoenix Contact Terminal Block UHV 25-AH, 2130431, LOT OF 10, SHIPSAMEDAY#141K1
Phoenix Contact TERM BLOCK PLUG 2POS STR 3.81MM, 1827703?, LOT OF 50 #141R2
Phoenix Contact RELAY EMG 17-REL/KSR- 24/21, 2940391, LOT OF 8 SHIPSAMEDAY#141N1
Phoenix Contact QTC 2.5 Terminal Block DIN Rail, 3206416, Lot of 50, SHIPSAMEDAY
Phoenix Contact Optosub-plus, 2799610, OPTOSUB-PLUS-K/OUT Shipsameday Free#1179P
Phoenix Contact Optosub-plus, 2799584, OPTOSUB-PLUS-K/IN, Shipsameday Free#1179N
Phoenix Contact MODULE TERM BLOCK 10-24AWG, 2972136, UMK-PVB6, RACK D #D53
Phoenix Contact Isolation I/O EMG 22-REL/KSR-24/21-21, 2950323 & RP420024 #137H2
PHOENIX CONTACT INTERBUS-S IBS 24 DI/LC, IBS24DI/LC, 24V, FRONT RACK BOX B #B
PHOENIX CONTACT INTERBUS-S IBS 24 DI/32, IBS24DI/32, 24V, SHIPSAMEDAY
Phoenix Contact High-current connector , UHV 25-AS/AS, 2130004, LOT OF 7
Phoenix Contact Ethernet Switch FL SFN8XT, 2891929, SHIPSAMEDAY
PHOENIX CONTACT CRIMP HAND TOOL, 1201882, ZA3 , SHIPSAMEDAY BOX A #108A11
PHOENIX CONTACT CDS Electronics IMC710 IMC715 IMC740A PC9420 PC9502 Pc9014 1179Q
Phoenix contact 3201084, Ferrule - AI 25-16 BN - 3201084, Qty 50 #102A1
Phoenix contact 3201068, Ferrule AI 10 -12 IV, 3201068 Qty 100, Lot Of 7 #102A3
PHOENIX CONTACT 2962670, UM 45-FLKS34, UM45FLkS34, ShipSameDay #109H
Phoenix Contact 2942506 CM62-PS-120AC/10DC/1 ShipSameDay W/2-3 Dayshipping#1172X
Phoenix Contact 2938947, Step-sp-100-240ac/24dc/1.5, Shipsameday#132AM
Phoenix Contact 2806862, IBSPRGCAB, 4501233018, ShipSameDay #1618B5
Phoenix Contact 1792553, MVSTBW2,5/5-ST, Lot Of 31, Shipsameday #1554M
Philips SChottly Diodes & Rectifier, BAT54C, 512-BAT54C, Lot Of 2944, F#34
Philips Lumiled HPWT-BL00, HPWTBL00, HPWT-BL00-d34, Lot Of 40, F#51
Philips Lumiled HPWT-BL00, HPWTBL00, HPWT-BL00-d34, Lot Of 40, F#50
Philips Lumiled HPWT-BD00-00000, HPWT-BD00-F05, Lot Of 29, F#45
PHILIPPINES UNION 2" FNPT SST, SP-83, SP83, Shipsameday
PHF Technology Group LAN C200139-55, MCS To Resolver Cable 55 FT #1205E
PHD Pneumatic Compact Cylinder CTS2U 40 X 5/8 - M, CTS2U40X5/8M #1643P2
PHD CTS1U50X11/4-M, 05777572-03, CTS1U 50 X 1 1/4-M, Shipsameday #135AC
PHD CTS1U50X11/4-M, 05777572-03, CTS1U 50 X 1 1/4-M Small Chip Shipsameday#135AD
PHD CRS2U63X1-B-R-T55, 01071329, 199910, CRS2U63X1BRT55, Shipsameday #105AG
PFEIFFER VACUUM COMPACT PIRANI GAUGE D-35614, TPR265, PTR26751A, 1-1/3 CF #156Z
PFAUDLER GASKET FAMILY 2" TYPE CR STYLE NSBN, 3168624, 2" ID X 4" OD, LOT OF 9
PFA Gaskleen Filter .003 MICRON, 1/2" Male VCR, SGLFPF6101VM, SHIPSAMEDAY#F1
PETER PAUL solenoid valve 1/2 orifice, 120V, 18W,72X00021GV, SHIPSAMEDAY#1649P1
Pepperl+Fuchs Sensor, Inductive, 085965, NBN40-L2-E0-V1, SHIPSAMEDAY#1231A3
Pepperl+Fuchs RJ15-N, 106556, ShipSameDay With 2-3 Days Shipping #1612N
Pepperl+Fuchs ProXimity Sensor DC, 088240, NBN8-12GM50-E0, LOT OF 3, SHIPSAMEDAY
Pepperl+Fuchs Palm Button PB2-008-6, PB20086, ShipSameday #1600B13, BOX B
Pepperl+Fuchs Capacitive sensor, CBN5-F46-E3, CBN5F46E3, ShipSameDay
PEPPERL+FUCHS 10-30VDC PROXIMITY SENSOR NBB10-30GM50-W0, SHIPSAMEDAY #1544B
PEPPERL FUCHS NJ15-30GK-N-150, PROXIMITY SWITCH SENSOR, 16193, #1554A6
PennEngineering SPACER SURFACE MOUNT, SMTSO-M25-2ET, SMTS0-M25-2ET, Lot Of 119
Penn 0850062001, 085-0062-00-1, Shipsameday #131E
PCB POWER TRANSFORMER MODULES, EPC-19, EPC19, LOT OF 16 #SHIPSAMEDAY
PBC Linear Square Bearing, 2 Sided, SBL24-2E, SHIPSAMEDAY#128F
Pb Mebtechnik STEAG IR TEMP-MODUL IRM12F-500 & IRM-W24/24 & IRM12F-500AS #1473Q9
PARKER/Swagelok/Ham-Let, SSH4-62Y, SS-810-2-8, SS-12-HC-A-1211, 765LSS1 #AA18
