【導(dǎo)讀】隨著時代的發(fā)展，當(dāng)今的技術(shù)也日趨完善、競爭愈演愈烈．單靠人工的操作。繼電器來控制人功率的啟動設(shè)備，而小功率的輸出設(shè)備直接連接就可以。的存入存儲器內(nèi)，而RAM只能作為CPU計算時臨時計算使用的緩沖空間。的非電氣專業(yè)人士也對PLC很快認(rèn)識并深入。以上僅僅是PLC的優(yōu)點之一，這也是人們比較容易理解的一部分，在很多的設(shè)備中，這里說HMl你根本不清楚它是什么，也沒有興趣了解，找一個中。文把它說明為觸摸屏或人機(jī)界面你就知道了，它和PLC的結(jié)合給了我們更大的空間。HMl的廠商目前也越來越多，功能也越來越強(qiáng)，價格也越來越低，使用的而越來越廣。HMl的前景可以說十分的看好。PLC之間的數(shù)據(jù)轉(zhuǎn)換采用。個表，對力的PLC通過讀取表中的數(shù)據(jù)來進(jìn)行操作。并可同時發(fā)送和接受。信息的傳送口線有半口和并口之分：通常的PLC是8位機(jī)，當(dāng)然電有16位機(jī)。但只要兩條或者三條口線就能解決問題，并能借用電話線術(shù)進(jìn)行遠(yuǎn)程控制。

　　

【正文】 rruption is not only a, sometimes existing jointly with the hour several inside break, break off to have the preferred Class, they will carry out the inteeruption of the higher Class according to person39。s request. This kind of breaks off the medium interruption to also became to break off the set. The Class that certainly break off is relevant according to various resources of CPU with internal PLC, also following a heap of capacity size of also relevant fasten. The contents that break off has a lot of kinds, for example the exterior break off,correspondence in of send out and accept the interruption and settle and tile clock that count break off, still have the WDT to reset the interruption etc., they enriched the CPU to respond to the category while handle various business. Speak thus perhaps you can39。t prehe~d the internal structure and opelation orders of the interruption pletely also, we do a very small example to explain. Each equipments always will not forget a button, it also is at we meet the urgent circumstance use of, that is nasty to stop the button. When we meet the Human body trouble and surprised circumstances we as long as press it, the machine stops all operations immediately, and wait for processing the over surprised empress recovertheoperation stop the internal 1/ O of the internal CPU of the buttonconjunction PLC to connect up, be to press button an exterior to trigger signal forCPU, the CPU carries oi1 to the I/O to examine again, being to confirm to have theexterior to trigger the signal, CPU protection the spot breaks off procedure counts themachine turn the homologous exterior I/ O automatically in the procedure to go toalso, be exterior intenuption plx)cedure processing plete, the procedure counts themachine to retunl the main procedure to continue to 1:00 can what toexplain is we generally would nasty stop the button of exterior break off to rise to thetallest Class, thus guarantee the safety. When we are work a work piece, giving the PLC a signal, counting PLC innerpart the machine add I to pute us for a day of workload, a count the machine andcan solve problem in brief, cel~ainly they also can keep the data under the condition of dropping the electricity, urging the data not to throw to lose, this is also what we hopeearnestly. Tile PLC still has the function that the high class counts the machine, being uswhile accept some datas of high speed, the high speed that here say is the data of thein all aspects tiny second class, for example the bar code scanner is scanning the datacontinuously, calculating high speed signal of the data processor DSP etc., we willadopt the high class to count the machine to help we carry on count. It at the PLCcarries out the procedure once discover that the high class counts the machine toshould of interruption, will let go of the work on the hand immediately. The trapezoiddiagram procedure that passes by to weave the distance again explains the high classfor us to carry out procedure to count machine would automatic performance toshould of work, thus rise the Class that the high class counts the machine to high one Class. You heard too many this phrases perhaps: crash, the meaning that is mostly is a workload of CPU to lead greatly, the internal resources shortage etc. the circumstance can39。t result in procedure circulate. The PLC also has the similar circumstance, there is a watchdog WDT in the inner part of PLC, we can establish time that a procedure of WDT circulate, being to appear tile procedure to jmnp to turn the mistake in the procedure movement process or the procedure is busy, movement time of the procedure exceeds WDT constitution time, the CPU turn but the WDT reset the appearance. The procedure restarts the movement, but will not carry on the breakage to tile interruption. Tile PLC development has already entered for work ages of correspondencefrom the mode of the one, and together other works control tile plank and I/O cardplanks to carry on the share easily. A state software can pass all s~ hardwares link,more animation picture of keep 8 the view to carries on the control, and cans pass theln~er to carry o/~ the control in the foreign /and, the blastoff that is like theabsolute being boat is to adopt this kind of way to make airship go up the sky. The development of the higher layer needs our continuous effort to emergence has already affected a few persons fully, we also obtained moreknowledge and precepts from the top one experience of the generation, ing tothe continuous development PLC technique, push it toward higher wave tide