※CP451-50 處理器模塊 支持模件自我診斷、故障隔離
在PLC體系規(guī)劃時，首先應(yīng)確認體系計劃，下一步作業(yè)便是PLC的規(guī)劃選型。挑選PLC,要是確認PL的生產(chǎn)廠家和PLC的具體類型。關(guān)于體系計劃要求有分布式體系、遠程)/0體系還需要考慮網(wǎng)絡(luò)化通訊的要求。那么具體應(yīng)該怎么挑選PLC呢?筆者以為應(yīng)該有以下幾方面的內(nèi)容。
一、PLC生產(chǎn)廠家的挑選
確認PLC的生產(chǎn)廠家要應(yīng)該考慮設(shè)備用戶的要求、用戶對PLC廠家的要求規(guī)劃者對PLC的了解程度和規(guī)劃習(xí)氣、配套戶品的一致性以及技術(shù)服務(wù)等方面的因素。從PLC本身的可靠性考慮，準則上只要是國外大公司的產(chǎn)品，不應(yīng)該存在可靠性欠好的問題。關(guān)于要求不高的，可選用高性價比的國產(chǎn)產(chǎn)品。筆者個人以為，一般來說，關(guān)于操控獨立設(shè)備或較簡略的操控體系的場合，配套日本的PLC產(chǎn)品，也能夠挑選西門子的產(chǎn)品，因為對該產(chǎn)品了解的人比較多。關(guān)于體系規(guī)模較大網(wǎng)絡(luò)通訊功用要椅、開放性的分布式澡控體系、遠程/O體系，歐美生產(chǎn)的PLCc在網(wǎng)絡(luò)通訊功用上更有優(yōu)勢。二、輸入輸出(/O)點數(shù)的預(yù)算
PLC的輸入/輸出點數(shù)是PC的根本參數(shù)之一。/O點數(shù)的確認應(yīng)以操控設(shè)備所需的一切輸入√輸出點數(shù)的總和為依據(jù)。在-般情況下，PLC的/O點應(yīng)該有適當(dāng)?shù)挠嗔俊?股依據(jù)計算的輸入輸出點數(shù)，再添加30%可擴展余量。
三、PLC存儲器容的預(yù)算
存情髏容量是指可編程序操控器本身能供給的硬件存儲單元大小，各種PLC的存情器容顯大小能夠從該PLC的根本參數(shù)表中找到，例如西門子的S7-314PLC的用戶程序存儲容量為64KB,S7-315-2DPPLC的用戶程序存儲容為128KB。程序容量是存情器中用戶程序所使用的存臨單元的大小，因而存情器容量應(yīng)大于程序容量。規(guī)劃階段，因為用戶使用程序還未繽制，因而，需要對程序容迸行預(yù)算。適當(dāng)添加容量。
由于一天當(dāng)中的用水需求會有變化，CP451-50處理器模塊·確保泵送系統(tǒng)在部分負載條件下有效運行非常重要。經(jīng)過驗證，增加一臺變頻器可以有效提高帶有電機的泵送系統(tǒng)的部分負載效率。變頻器可直接控制電機的速度和轉(zhuǎn)矩，它可以確保電機保特更佳的工作效率，這比讓電機全速運行以及使用闊門和節(jié)流閥來控制流量高效得多。通常來講，使用變頻器和高效電機可以節(jié)省25.30%的能源。
許多公共供水系統(tǒng)都會使用長達幾十年的舊電機，而這些舊日電機能效等級通常較低。升級成更加高效的新電機可降低電機損耗，并進一步節(jié)約能源。每個IE等級都能減少20%的能籍，也就是說，IE4電機與IE3電機相比，CP451-50處理器模塊能耗將減少20%。而像AB的E5同步磁阻電機。(SynRM這樣的超高效率E5電機來講，減少的總能耗可高達40%。因此，更換舊電機(即侵舊電機能正常使用)通常僅在幾年后就能收回成本。
In the PLC system planning, the system plan should be confirmed first, and the next step is the PLC planning and selection. Select PLCS, if you confirm the manufacturer of PL and the specific type of PLC. Regarding the system plan, there are distributed system, remote)/0 system, and the requirements of network communication need to be considered. So how to select PLC? I think there should be the following aspects of the content.
First, the selection of PLC manufacturers
Confirm that the PLC manufacturer should consider the requirements of equipment users, user requirements for PLC manufacturers planners of PLC understanding and planning habits, the consistency of supporting household products and technical services and other factors. From the reliability of PLC itself, as long as the standards are products of large foreign companies, there should not be poor reliability problems. For those with low requirements, cost-effective domestic products can be selected. The author personally believes that, in general, on the occasion of controlling independent equipment or a simpler control system, supporting Japanese PLC products, you can also choose Siemens products, because there are more people who know about the product. Regarding the larger network communication function of the system, the open distributed shower control system, and the remote /O system, the PLCc produced in Europe and the United States has more advantages in the network communication function. 2. Budget of input and output (/O) points
The number of PLC input/output points is one of the fundamental parameters of PC. The confirmation of /O points shall be based on the sum of all input √ output points required to operate the device. In general, the PLC /O point should have an appropriate margin. - Add 30% expandable margin based on calculated input and output points.
Three, PLC memory capacity budget
The memory capacity refers to the programmable controller itself can supply the size of the hardware storage unit, the memory capacity of various PLC can be found from the basic parameter table of the PLC, such as Siemens S7-314PLC user program storage capacity of 64KB,S7-315-2DPPLC user program storage capacity of 128KB. Program capacity is the size of the memory unit used by the user program in the memory, so the memory capacity should be greater than the program capacity. In the planning stage, because the user has not yet used the program, it is necessary to budget for the program. Add capacity appropriately.
As water demand varies throughout the day, it is important for the CP451-50 processor module to ensure that the pumping system operates efficiently under partial load conditions. It has been proved that adding a frequency converter can effectively improve the partial load efficiency of the pumping system with a motor. The frequency converter can directly control the speed and torque of the motor, which can ensure the motor to maintain the best efficiency, which is much more efficient than running the motor at full speed and using wide doors and throttle valves to control the flow. In general, the use of frequency converters and high-efficiency motors can save 25.30% of energy.
Many public water systems use decades-old motors, which often have lower energy efficiency ratings. Upgrading to a new, more efficient motor reduces motor losses and further saves energy. Each IE level can reduce the energy consumption by 20%, that is, the CP451-50 processor module will consume 20% less energy than the IE4 motor compared to the IE3 motor. And E5 synchronous reluctance motors like AB. For ultra-efficient E5 motors like SynRM, total energy consumption can be reduced by up to 40%. Therefore, replacing the old motor (that is, the old motor can be used normally) usually pays for itself after only a few years.
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