plc中英文翻譯-資料下載頁
2024-11-01 16:21本頁面
【導讀】今天的PLC將面對日益復雜的挑戰(zhàn)。一旦他們悄悄地取代繼電器，對于今年的年度PLC技術(shù)的更新，我們對PLC的制造商會就這些主題提出更多。更高水平的PLC編程語言已經(jīng)推行有一段時間了，但最近的流行，如雨后春筍般。作使用，梯形邏輯比語言變得更加實際，有效和強大的。舉例來說，很難寫三角函數(shù)使用梯。到目前為止，PLC的沒有大量用于連續(xù)過程控制，會繼續(xù)嗎？“我感覺到了，PLC將用。會發(fā)生，已經(jīng)實行了PLC的應用優(yōu)化的過程。富瑞安的經(jīng)理認為PLC將越來越多地使用食品。務將引用更多的PLC技術(shù)，PLC功能比以往任何時候都要多。但是，不少人失望的發(fā)現(xiàn)完成地圖規(guī)范并沒有立即出現(xiàn)。除了少數(shù)例外，I/O是仍然專有技術(shù)。許多人說，I/O是這樣一個高價值項目，PLC制造商將永遠希望保持它的專有性。出于這個原因，他說，PLC的制造商將不會開始銷售通用I/O和其他廠商的系統(tǒng)。
【正文】 IBM PCpatible equipment. Allebradeley, Could, and Cincinnati Milacron already have, and rumor has it that GE is planning something along these same lines .Bill Ketelhut, manage of product planning at GE Fanuc North America ,sees this sort of thing as alternative to universal I/O.I think the trend ,instead of toward universal I/O, will be multiple host interface , he says .Jodie Glore ,director of marking, Square D Automation Products, Views it as another indication that PLCs are, and have been for some time, industrial puters. PLCs and PCs If the IBM 7552, the Action Instruments BC22,and other puters are appearing on the factory floor, won39。t this mean new petition for PLCs? Rich Ryan: There are some control functions that are better jobs for puters. Programmable controllers have been forced to fit into those applications. Yet, the majority of vendors we surveyed don39。t like the PC invasion will pose a problem for them .Most said that PLCs and PCs are enough apart in architecture that they will usually do the control. They don39。t feel that PCs will take jobs from PLCs just because PLC I/O modules can now be connected to PCs。 they believe this simply means that PLCs and PCs will be able to share the same data. There are inherent architectural differences between a general purpose puter, says Rich Ryan, and a programmable controller .There are hardware constructs built into almost every manufacture39。s programmable controller today that customize the hardware to run ladder logic and to solve machine code. One fundamental difference he cites is called state of the machine .Ryan: When you shut the machine off, or interrupt the cycle, or you jump to another spot in the cycle, programmable controllers inherently remember the state of the machine: what the timers were, what the counters were ,what the states of all the latches were .Computers don39。t inherently do that.
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