【正文】 y on the data exchanges through the data transmission instruction directly, but is not a very viable way in the correspondence, because the PLC of the other party must has been wait for your data exportation at the time of sending out the data, it can39。 PLC的抗干擾是極其優(yōu)秀的，我們根本不用去關(guān)心它的使用壽命和工作場(chǎng)合的惡劣，這些所有的問(wèn)題已不再成為我們失敗的主題，而留給我們的是關(guān)心如何來(lái)利用 PLC的內(nèi)部資源為我們加強(qiáng)設(shè)備的控制能力，使我們的設(shè)備更加的柔性。 在很多場(chǎng)合，單靠單機(jī)的控制是無(wú)法保證設(shè)備的順暢運(yùn)行，而 通過(guò)設(shè)備與設(shè)備的信息交流達(dá)到我們想要的效果。單工位的意義也就是說(shuō)兩者之間，一個(gè)只能發(fā)送，而一個(gè)只能接收，比如一個(gè)特務(wù)他只能接收上司的指示，而無(wú)法給上司回復(fù)；半雙工位也就是兩個(gè)能都能發(fā)送和接受數(shù)據(jù)，但不能同時(shí)發(fā)送和接受，比如你打電話時(shí)是不能接電話 ,對(duì)方也一樣；而全雙工位是兩者之間都能發(fā)送和接受數(shù)據(jù)，并可同時(shí)發(fā)送和接受。串口速度比較慢，但只要兩條或者三條口線就能解決問(wèn)題，并能借用電話線來(lái)進(jìn)行遠(yuǎn)程控制。當(dāng)然中斷的級(jí)別根據(jù)各種 PLC內(nèi)部 CPU的資源有關(guān)，同時(shí)也跟堆棧的容量大小也有關(guān)系。它在PLC執(zhí)行程序時(shí)一旦發(fā)現(xiàn)高級(jí)計(jì)數(shù)器對(duì)應(yīng)的中斷，就會(huì)立即放下手上 的工作。 PLC的出現(xiàn)已經(jīng)足足影響了幾代人，我們也從上一輩的經(jīng)驗(yàn)中獲取了更多的知識(shí)和教訓(xùn)，來(lái)不斷的發(fā)展 PLC技術(shù)，將它推向更高浪潮。程序重新開(kāi)始運(yùn)行，但對(duì)中斷不會(huì)進(jìn)行破壞。急停按鈕連接 PLC內(nèi)部 CPU的內(nèi)部 I/O 接口上，當(dāng)按鈕給 CPU一個(gè)外部觸發(fā)信號(hào)時(shí)， CPU對(duì) I/O 進(jìn)行再次檢測(cè)，當(dāng)確認(rèn)有外部觸發(fā)信號(hào)時(shí)， CPU 保護(hù)現(xiàn)場(chǎng)并將程序計(jì)數(shù)器自動(dòng)轉(zhuǎn)到相應(yīng)的外部 I/O中斷程序中去，當(dāng)外部中斷程序處理完畢，程序計(jì)數(shù)器返回到主程序繼續(xù)工作。它的特點(diǎn)在于我們?cè)谠O(shè)備的操作過(guò)程中可能會(huì)遇到緊急的突發(fā)事件，我們要立刻的停下手上的工作，去處理更重要的事情，這種情況是我們經(jīng)常所遇到的， PLC在去執(zhí)行緊急的任務(wù)時(shí)，總會(huì)先保存目前的狀態(tài)，比如程序的地址， CPU 的累加器數(shù)據(jù)等，就像我們?nèi)ラ_(kāi)門時(shí)要記下我們看的書在第幾頁(yè)了或者干脆作個(gè)記號(hào)，因?yàn)槲覀兇龝?huì)還要繼續(xù)接著看后面的書。在一些專用的設(shè)備中應(yīng)用的越來(lái)越廣泛，像專用的醫(yī)療設(shè)備、數(shù)字信號(hào)設(shè)備等，在比較單一數(shù)據(jù)的傳輸中，它的效果非常的好。PLC 之間的數(shù)據(jù)轉(zhuǎn)換采用 RS232 接口來(lái)傳送數(shù)據(jù)，而 RS232 接口只能保證 10米的傳輸距離，如果在 1000米的距離內(nèi)我們 可以通過(guò) RS485來(lái)進(jìn)行通信，更長(zhǎng)的距離只能通過(guò) MODEL來(lái)進(jìn)行傳輸。 HMI 控制不僅僅是減少了控制按鈕，增加控制的靈活性，更主要的它是可順序性的，而且在能夠改變數(shù)據(jù)輸入和數(shù)據(jù)輸出反饋，在溫度控制曲線的模擬也能直觀的顯示出來(lái)。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 the procedure to jump 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 the interruption. The PLC development has already entered for work ages of correspondence from the mode of the one, and together other works control the plank and I/ O card planks to carry on the share easily. A state software can pass all se hardwires link, more animation picture of keep the view to carries on the control, and cans pass the Inter to carry on the control in the foreign land, the blastoff that is like the absolute 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 obtain. The PLC emergence has already affected a few persons fully, we also obtained more knowledge and precepts from the top one experience of the generation, ing to the continuous development PLC technique, push it toward higher wave tide. 可編程控制器技術(shù)討論與未來(lái)發(fā)展 隨著時(shí)代的發(fā)展 ,當(dāng)今的技術(shù)也日趨完善、競(jìng)爭(zhēng)愈演愈烈 。t give the superior reply。 The I/ O add inner part is tired the input and output system of the machine and exterior link, and deposit the related data into the procedure saving machine or data saving machine。 the operation that list depends the artificial has already can39。s machine bine, for resolve the very plicated problem to look for the best path We e in sight of the control that links after the electric appliances in various situation, that is already the that time generation past, now of after use in the mold a perhaps simple equipments of grassroots control that the electric appliances can do for the low level only。 to be good very. At a lot of situations, the list is a smooth movement that can39。t do other works. When you are reading the book, you hear someone knock on door, you s top to start up of affair, open the door and bine to continue with the one who knock on door a dialogue, the telephone of this time rang, you signal hint to connect a telephone, after connecting the telephone through, return overdo e together knock on door to have a conversation, after dialogue plete, you continue again to see your book, this kind of circumstance we are called the interruption to it, it has the authority, also having sex of have the initiative, the PLC had such function .Its characteristics lie in us and may meet the urgently abrupt affairs in the operation process of the equipments, we want to stop to start immediately up of work, the whereabouts manages the more important affair, this kind of circumstance is we usually meet of, PLC while carry out urgent mission, total will keep the current appearance first, for example the address of the procedure, CPU of tired add the machine data etc., be like to stick down which the book that we