外文翻譯--plc控制系統(tǒng)設(shè)計的要點-文庫吧資料
2024-12-12 04:21本頁面
【正文】 hical programming device or software package programming may direct programming, if using handheld programming device programming, should be painted Trapezoid Chart before programming, so can less mistakes speed was fast. After the first air conditioning programming procedures to be normal functioning of all, again in equipment debugging.PLC控制系統(tǒng)設(shè)計的要點可編程序控制器 (可設(shè)計的控制器) 本來應(yīng)簡稱個人計算機，為了與個人計算機的簡稱個人計算機相區(qū)別,一般將它簡稱為 PLC(可設(shè)計的邏輯控制器)。s Plc development software packages expensive, and that means not at the scene debugging. Therefore, the system should be based on the size and level of difficulty, the length of the development cycle and reasonable funding of the purchase Plc products.Fifth, And large panies to choose their quality guaranteed products, and good technical support, after sales services are generally better, but also help expand your product and software upgrades.For small systems, such as 80 points within the system. Generally do not need expansion。 15 machines might require 15 different controllers. Now it is possible to use just one model of a PLC to run any one of the 15 machines. ②Implementing Change and Correcting Errors. With a wired relaytype panel, any program alterations require time for rewriting of panels and devices. When a PLC program circuit or sequence design change is made, the PLC program can be changed from a keyboard sequence in a metter of minutes. No rewiring is required for a PLCcontrolled system.③Large quantities of contacts. The PLC has a large number of contacts for each coil available in its that a panelwired relay has four contacts and all are in use when a design change requiring three more contacts is made. Time would have to be taken to procure and install a new relay or relay contact block. Using a PLC, howere, only three more contacts would be typed in. the three contact would be automatically available in the PLC. Indeed, a hundred contacts can be used from one relayif sufficient puter memory is available. ④Lower cost. Increased technology makes it possible to condense more functions into smaller and less expensive packages. Now you can purchase a PLC with numerous relays, timers and counters, a sequencer, and other function for a few hundred dollars.⑤Pilot Running. A PLC programmed circuit can be evaluated in the office or lab. The program can be typed in, tested, observed, and modified if needed, saving valuable factory time. In contrast, conventional relay systems have been tested on the factory floor, which can be very time consuming.⑥Visual Observation. A PLC circuit’s operation can be seen during operation directly on a CRT screen. The operation or misoperation of a circuit can be observed as it happens. Logic paths light up on the screen as they are energized. Troubleshooting can be done more quickly during visual observation. In advanced PLC systems, an operator message can be programmed for each possible malfunction.In advanced PLC systems, an operator message can be programmed for each possible malfunction. The malfunction description appears on the screen when the malfunction is detected by the PLC logic. Advanced PLC systems also may have descriptions of the function of each circuit ponent. ⑦Speed of Operation. Relays can take an unacceptab
研究報告相關(guān)推薦
鄂ICP備17016276號-1