【正文】 remove the power rack and rack screws connected, power rack can be removed。 (3) RAM module to remove or insert the CPU from the CPU prior to disconnect the PC39。 (6) pluggable template, to be more careful, gently, and the goods shipped out of static electricity。s ties cable should lie alone, prevents the outside signal the disturbance. (5) The exchange output line and the directcurrent output line do not use the identical root electric cable, the output line to be far away from the high tension line and the power line as far as possible, avoids parallel. Third, I/O end wiring 1. Input wiring (1) inputs the wiring not to surpass 30 meters generally. But if the environment disturbance is small, when the loss of voltage is not big, the input wiring may suitable long. (2)Inputs/the output line not to be able to use the identical root electric cable, the input/output line to be separated. (3)Uses the normally opened contact form to connect the input end as far as possible, causes the establishment the trapezoidal chart to be consistent with the relay schematic diagram, is advantageous for reading. 外文翻譯（ 原文 ） 6 2. Outgoing junction (1) The output wiring divides into the independent output and the public output. In not group, may use the different type and the voltage class output voltage. But can only use the identical type, the identical voltage class power source in the identical group39。s service life, therefore, time use inductive load the selective relay working life must be long. (4) The PLC output load possibly has the disturbance, must therefore take the measure to control, if directcurrent output39。 when the power source restores, if RUN input connection, then operates carries on automatically. Therefore, to establish the essential current limiting protection circuit to some easy overloading39。 If must use the expansion unit, its ground point should accept after checking with the elemental area earth in the same place. In order to suppress adds in the power source and the input end, outport39。 advocates the CPU work, but the spare CPU output is forbidden, when advocates CPU breaks down, spare CPU automatic investment movement. This cut process is controlled by the redundancy processing unit RPU, the switching time in 1~3 scanning periods, the I/O system39。t prehend the internal structure and operation orders of the interruption pletely also, we do a very small example to explain. Each equipment always will not forget a button, it also is at we meet the urgent circumstance use of, which 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 recover the operation again. Nasty stop the internal I/ O of the internal CPU of the button conjunction PLC to connect up, be to press button an exterior to trigger signal for CPU, the CPU carries on to the I/ O to examine again, being to confirm to have the exterior to trigger the signal, CPU protection the spot breaks off procedure counts the machine turn the homologous exterior I/ O automatically in the procedure to go to also, be exterior interruption procedure processing plete, the procedure counts the machine to return the main procedure to continue to work. Have 1:00 can what to explain is we generally would nasty stop the button of exterior break off to rise to the tallest Class, thus guarantee the safety. When we are work a work piece, giving the PLC a signal, counting PLC inner part the machine add 1 to pute us for a day of workload, a count the machine and can solve problem in brief, certainly 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 hope earnestly. The PLC still has the function that the high class counts the machine, being us while accept some dates of high speed, the high speed that here say is the data of the in all aspects tiny second class, for example the bar code scanner is scanning the data continuously, calculating highspeed signal of the data processor DSP etc., we will 外文翻譯（ 原文 ） 11 adopt the high class to count the machine to help we carry on count. It at the PLC carries out the procedure once discover that the high class counts the machine to should of interruption, will let go of the work on the hand immediately. The trapezoid diagram procedure that passes by to weave the distance again explains the high class for us to carry out procedure to count machine would automatic performance to should 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。s list what munications are available and when they would be best applied. To understand the PLC39。固定式 PLC 包括CPU 板、 I/O 板、顯示面板、內(nèi)存塊、電源等，這些元素組合成一個(gè)不可拆卸的整體。但工作節(jié)奏由震蕩信號(hào)控制。 PLC 使用系統(tǒng)存儲(chǔ)器（現(xiàn)在大部分采用閃存技術(shù)了）用于過(guò)程控制系統(tǒng)。由于快擦型存儲(chǔ)器技術(shù)的應(yīng)用，使得這個(gè)過(guò)程大大縮短了。一個(gè)輸入的實(shí)際狀態(tài)存儲(chǔ)狀態(tài)存儲(chǔ)在專(zhuān)用存儲(chǔ)器位上，為“ 1”或者“ 0”。 PLC 控制器可以通過(guò)計(jì)算機(jī)（通常方式）重新編程，但是也可以通過(guò)人工編程器 9 控制臺(tái)）編程。一旦系統(tǒng)修改結(jié)束，將正確的程序重新讀入 PLC 控制器也是非常重要的。圖表驗(yàn)證對(duì)于理解、定義失敗和故障非常必要。這將加快由于損壞零件而引起的任何問(wèn)題的修理速度。大部分 PLC 控制器的工作電壓為 24VDC 或者 220VAC。 該電源一般不用于啟動(dòng)外部輸入或輸出。 PLC 是專(zhuān)門(mén)為工業(yè)生產(chǎn)服務(wù)的控制裝置，通常不需要采取什么措施，就可以直接在工業(yè)環(huán)境中使用。 PLC 的輸入與輸出最好分開(kāi)走線(xiàn)，開(kāi)關(guān)量與模擬量也要分開(kāi)敷設(shè)。 三、 I/O 端的接線(xiàn) 輸入接線(xiàn) （ 1）輸入接線(xiàn)一般不要超過(guò) 30 米。 2． 輸出連接 （ 1）輸出端接線(xiàn)分為獨(dú)立輸出和公共輸出。（ 3）采用繼電器輸出時(shí)，所承受的電感性負(fù)載的大小，會(huì)影響到繼電器的使用壽命，因此，使用電感性負(fù)載時(shí)選擇繼電器工作壽命要長(zhǎng)。對(duì)于能使用戶(hù)造成傷害的危險(xiǎn)負(fù)載，除了在控制程序中加以考慮之外，還應(yīng)設(shè)計(jì)外部緊急停車(chē)電路，使得 PLC 發(fā)生故障時(shí)，能將引起傷害的負(fù)載電源可靠切斷。但當(dāng)可編程控制器 CPU 故障時(shí)就不能控制輸出，因此，對(duì)于能使用戶(hù)造成傷害的危險(xiǎn)負(fù)載，為確保設(shè)備在安全狀態(tài)下運(yùn)行，需設(shè)計(jì)外電路加以防護(hù)。（ 5）重大故障的報(bào)警及防護(hù)。為了抑制加在電源及輸入端、輸出端的干擾，應(yīng)給 PLC 接上專(zhuān)用地線(xiàn)，接地點(diǎn)應(yīng)與動(dòng)力設(shè)備（如電機(jī)）的接地點(diǎn)分開(kāi)；若達(dá)不到這種要求，也必須做到與其它設(shè)備公共接地，禁止與其它設(shè)備串連接地