變頻器控制方式特點(diǎn)：
其特點(diǎn)是控制電路結(jié)構(gòu)簡單、成本較低，機(jī)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(yīng)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(jī)械特性終究沒有直流電動機(jī)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(fù)載的變化而變化，轉(zhuǎn)矩響應(yīng)慢、電機(jī)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(yīng)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(diǎn)：
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(yīng)用比較廣泛的通訊協(xié)議，但保留了*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(jī)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(kuò)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(jìn)行擴(kuò)展，只能用本體上的RS485口，在這一點(diǎn)上功能強(qiáng)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(jìn)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。
Regal Joint Flow Sensor FS-10S, FS-10, FS-S, Shipsameday w/2-3day #1638Q
Reducing Tee CF 1-1/3" X QF-16, 4.625" X 1.5" X 1.5", #1371E
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Red Lion Meter Display CUB4LP00/3800, CUB4LP/CL, CUB4LP00, Shipsameday #121P8
RECHNER-SENSOR Proximity SENSOR 300200, L6A/L80403, AB1466, SHIPSAMEDAY
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Rainbow Technologies Sentinel JVY UP3, 282713517, 122001254, LOT OF 5#15354Q14
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pyro mation R1T185L483-004-SL-6HN31, sensor temp, R1T185L483004SL6HN31 #117A4
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Proteus Industries Fluid Flow Switch 150SST, 1/2" VCO, MissingCoverScrew #1623P2
Prostar PRX40233, 3000PSI Praxair Dual-Analog Gauge 100 Psi, RACK D BOTOM #D17
PROSENSE Pressure Transmitter 1/4" NPT, PTD25-10-VH, SHIPSAMEDAY#102V9
Process Technology Freeze Protection Valve 200 psi, PT62, PT-62 Shipsameday#144A
PRESSURE SWITCH ADJUSTABLE APS-801-E, APS801E, Shipsameday #120T
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