單片機(jī)畢業(yè)外文翻譯(存儲(chǔ)版)
【正文】 協(xié)，他們將要加大對(duì)通信結(jié)構(gòu)的不支持。說(shuō)：“ I/O將在硬件銷(xiāo)售中不成比例。克特爾胡特， GE Fanuc北美的產(chǎn)品規(guī)劃經(jīng)理，認(rèn)為是I/O的普及“我想多個(gè)主機(jī)接口將代替I/O的趨勢(shì)，”他說(shuō)。PLC的 I / O和個(gè)人電腦的連接雖然不同的PLC廠商可能會(huì)繼續(xù)用專有的I/O，但一些廠商使I/O連接到IBM PC這樣的兼容設(shè)備成為可能。許多人說(shuō)，I/O是這樣一個(gè)高價(jià)值項(xiàng)目， PLC制造商將永遠(yuǎn)希望保持它的專有性。但弗蘭克紐伯恩，副歐姆龍工業(yè)部總裁，報(bào)告說(shuō)，由于缺乏公司的定義，歐姆龍的PLC還談不上規(guī)范?！蓖ㄐ藕鸵?guī)范在整體上通信是至關(guān)重要的個(gè)人自動(dòng)化單元對(duì)自動(dòng)化工廠來(lái)說(shuō)。 幾個(gè)供應(yīng)商，顯然是把賭注押在相反會(huì)發(fā)生，已經(jīng)實(shí)行了PLC的應(yīng)用優(yōu)化的過(guò)程。這后一種安排是有用的在微機(jī)外部同步是必需的時(shí)候。計(jì)時(shí)器然后減少此值產(chǎn)生中斷或設(shè)置標(biāo)記時(shí)，計(jì)數(shù)器到達(dá)零。異步和同步通信模式都要求提供幀（啟動(dòng)和停止）的信息協(xié)議。并行輸入/ 輸出在不同的微機(jī)中并行輸入和輸出的機(jī)制有所不同。特殊功能寄存器，如堆棧指針或定時(shí)器寄存器，往往被以邏輯形式納入內(nèi)存區(qū)域。一些制造商在其提供的設(shè)備包括的范圍（或?qū)Ｓ茫?。t begin selling universal I/O system from other vendor. if we start selling that kind of product, says jannotta, what do we manufacture?With more intelligent I/O appearing, Sal Provanzano feels this will lead to more differentiation among I/O from different makers. Where the I/O bees extremely intelligent and bees part of the system, he says, it really is hard to define which is the I/O and which is CPU. It really CPU, if you will, is equally integrated into the system as the I/O.Connecting PLC I/O to PCsWhile different PLCs probably will continue to use proprietary I/O, several vendors make it possible to connect5 their I/O to IBM PCpatible equipment. Allebradeley, Could, and Cincinnati Milacron already have, and rumor has it that GE is planning something along these same lines .[4]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 twoard 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.中文譯文單片機(jī)是電腦和集成電路發(fā)展的巔峰，有據(jù)可查的是他們也是20世紀(jì)最有意義的兩大發(fā)明。t appear immediately .Says Larry Komarek: Right now, MAP is still a moving target for the manufacturers, a specification that is not final .Presently, for example. people are introducing products to meet the . products will be obsolete when the new standard for is introduced.Because of this, many PLC vendors are holding off on full MAP implementations. Omron, for example, has an ongoing MAPpatibility program。s increasing interest in languages like C and BASIC.PLCs in process controlThus far, PLCs have not been used extensively for continuous process control .Will this continue? The feeling that I39。piggyback39。 in most a mechanism is provided to at least allow some flexibility of choosing which pins are outputs and which are inputs. This may apply to all or some of the ports. Some I/O lines are suitable for direct interfacing to, for example, fluorescent displays, or can provide sufficient current to make interfacing other ponents straightforward. Some devices allow an I/O port to be configured as a system bus to allow offchip memory and I/O expansion. This facility is potentially useful as a product range develops, since successive enhancements may bee too big for onchip memory and it is undesirable not to build on the existing software base.Serial input/outputSerial munication with terminal devices is mon means of providing a link using a small number of lines. This sort of munication can also be exploited for interfacing special f
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