有關現(xiàn)場總線控制外文資料翻譯-資料下載頁
2025-05-12 00:37本頁面
【導讀】勢，介紹了幾種較為流行的現(xiàn)場總線，構建了企業(yè)生產的。DDE技術和使用統(tǒng)一的協(xié)議標準三種集成方式?？刂埔蟮牟粩嗵岣?，控制程度的愈加復雜使長久以來在生產中。工業(yè)過程控制系統(tǒng)迫切地需要高級理論的支撐。與理論發(fā)展相對滯后。式全分布的現(xiàn)場總線控制系統(tǒng)。的現(xiàn)場設備間信息交換的主要技術?，F(xiàn)場總線具有以下特點:①快速性、實時性;②開放性、互。構的高度分散性;⑤較強的抗干擾性。現(xiàn)場總線的最大特點是標準化?，F(xiàn)場總線中最具影響力。的有5種，分別是FF,Profitbus,HART,CAN和LonWorks。定義了物理傳輸特性，總線存取協(xié)議和應用功能。通過良好的接地處理和保護，具有極高的抗干擾能力。最后通過組建上位機與PLC的通信以太網絡和。通過該監(jiān)控網絡，可實現(xiàn)對該水電站分居于八個不同壩段的閘。站實際生產的各項要求，同時還保證了該系統(tǒng)具有相當?shù)南冗M性。值得指出，PLC的輸出總是為增量值。我們推薦一種在PLC上采模糊。邏輯算法由基本的PLC指令來實現(xiàn)。參數(shù)的變化加以調節(jié)。
【正文】 then executed rungbyrung. Scanning the program and solving the logic of the various ladder rungs determine the output states. The updated output states are stored in fixed memory locations (output image memory). The output values held in memory are then used to set and reset the physical outputs of the PLC simultaneously at the end of the program scan. As we know, logic control is a remarkable property of PLC, and it can be applied to efficiently handle analog data. 1) Analog data acquisition and transformation Analog inputs and outputs such as pressure and temperature need to be measured online. For instance, temperature is first acquired by the Platinum resistances. A signal transformation module then converts the measured resistance value into the voltage range of 15V. The output of this transformation module is finally collected and transmitted back to the above PLC. 2) PLC control algorithms The analog variables could be any controlled variable, ., temperature or pressure in our winding system. As a matter of fact, there exist two control modes, auto and manual. In the manual mode, operators modify the output values according to the desired levels。 while in the auto mode, output values are regulated by the predesigned control algorithms. It is worth mentioning that the outputs of PLC are always incremental values. Although autotuning PID controllers can be employed here, manual tuning is always used at the beginning of the production for routine initialization, and after that the system is switched to the auto mode. We emphasize that user39。s experiences oriented fuzzy logic controllers are utilized here to further improve the production performance as well. A film tension control system using fuzzy logic controller (PLC) on PLC to cope with the winding system uncertainty is proposed. Fuzzy logic algorithm is realized by basic PLC instructions. To deal with the system with fixed model and parameter conventional PID is enough, but fixture is relative, in fact, the parameters of the winding system are variable in a definite range, therefore the controller must has a Monitoring System for PLC Controlled Manufacturing System Based on Fieldbus robustness to obtain high performance. For this purpose, fuzzy reasoning is used to adjust the factors of PID, by this way the PID factors can be adjusted according to the changes of system state and plant parameters.
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