外文翻譯----plc自動(dòng)提高控制系統(tǒng)可靠性的方法

1、<p>　　PLC automatic control system to improve the reliability</p><p>　　1. The main reasons for the lower control system reliability </p><p>　　Although the main reason for the decline in ind

2、ustrial control system reliability and control aircraft PLC itself has high reliability But if the input signal to the PLC Switch mistakes analog signal larger deviations, Output PLC control by the implementing agencies

3、do not require action, which will enable control of mistakes The economic losses caused irreparable. PLC wrong signal to the scene affect the importation of the main reasons are: 1. Signal transmission line caused a shor

4、t circuit or </p><p>　　2. Designed Fault Alarm System </p><p>　　Sound design fault in the alarm system in automatic control system design, we designed a three-level fault display and warning sys

5、tem. 1 in the control of the control cabinet-level panel set up with the normal operation of the equipment and troubleshooting instructions light. When the corresponding light-normal operation of the equipment, the opera

6、tion of the equipment malfunction indicator light to the frequency of 1Hz scintillation. Light bulbs to prevent damage to equipment not properly refle</p><p>　　3. Input Signal Reliability </p><p&g

7、t;　　PLC input signal to the scene to improve the reliability, it is first necessary to choose the higher reliability of the transmitter, and various switches. Signal transmission lines to prevent short circuit caused a v

8、ariety of reasons, disconnected or have access to. Second, in the process of increasing digital filtering process and increase the credibility of the input signal. Design digital signal filtering methods are available, i

9、nput contact at the scene after the one timer. Contact timing ji</p><p>　　4. Reliability implementing agencies </p><p>　　When the input signal to accurately PLC, PLC enforcement procedures resul

10、ts through the implementation of regulatory agencies on-site installations, control. How to ensure that control requirements by implementing agencies, as required when implementing agencies did not work, and how defects?

11、 When we adopt the following measures: Supported by the contactor control when to start or stop this kind of load contactor coil control. contactor pull reliable start and stop when it contacts for the relea</p>&

12、lt;p>　　Troubleshooting equipment SR PLC light inside the aircraft and equipment, beneficial to the entire control system PLC find fault. All programming is the main diagnostic tool, he can easily inserted PLC above. T

13、he programmer can observe the entire control system of the state, when you go to find the core of the PLC control system malfunction. as a habit, you should bring a programmer. Search basic fault order to ask the followi

14、ng questions, based on the reasonable actions found no case-by-case ba</p><p>　　PLC自動(dòng)提高控制系統(tǒng)可靠性的方法 一、控制系統(tǒng)可靠性降低的主要原因 雖然工業(yè)控制機(jī)和可編程控制器本身都具有很高的可靠性，但如果輸入給PLC的開(kāi)關(guān)量信號(hào)出現(xiàn)錯(cuò)誤，模擬量信號(hào)出現(xiàn)較大偏差，PLC輸出口控制的執(zhí)行機(jī)構(gòu)沒(méi)有按要求動(dòng)作，這些都可能使控制過(guò)程出

15、錯(cuò)，造成無(wú)法挽回的經(jīng)濟(jì)損失。影響現(xiàn)場(chǎng)輸入給PLC信號(hào)出錯(cuò)的主要原因有：1、造成傳輸信號(hào)線短路或斷路（由于機(jī)械拉扯，線路自身老化，連接處松脫等），當(dāng)傳輸信號(hào)線出故障時(shí)，現(xiàn)場(chǎng)信號(hào)無(wú)法傳送給PLC，造成控制出錯(cuò)。2、機(jī)械觸點(diǎn)抖動(dòng)，現(xiàn)場(chǎng)觸點(diǎn)雖然只閉合一次，PLC卻認(rèn)為閉合了多次，雖然硬件加了濾波電路，軟件增加微分指令，但由于PLC掃描周期太短，仍可能在計(jì)數(shù)、累加、移位等指令中出錯(cuò)，出現(xiàn)錯(cuò)誤控制結(jié)果。3、現(xiàn)場(chǎng)變送器，機(jī)械開(kāi)關(guān)自身出故障，如觸點(diǎn)接觸

16、不良，變送器反映現(xiàn)場(chǎng)非電量偏差較大或不能正常工作等，這些故障同樣會(huì)使控制系統(tǒng)不能正常工作。影響執(zhí)行機(jī)構(gòu)出錯(cuò)的主要原因有： 1、控制負(fù)載的接觸不能可靠動(dòng)作，雖然PLC發(fā)出了動(dòng)作指令，但執(zhí)行機(jī)構(gòu)并沒(méi)按要求動(dòng)作。2、控制變頻器起動(dòng)，由于變頻器自身故障，變頻器所帶電機(jī)并沒(méi)按要求工作。3、各種電動(dòng)閥、電磁閥該開(kāi)的</p><p>　　五 一般查找故障步驟</p><p>　　其他步驟于用戶(hù)的邏輯知

17、識(shí)有關(guān)。下面的一些步驟，實(shí)際上只是較普通的，對(duì)于您遇到的特定的應(yīng)用問(wèn)題，尚修改或調(diào)整。查找故障的最好工具就是 您的感覺(jué)和經(jīng)驗(yàn)。首先，插上編程器，并將開(kāi)關(guān)打到RUN位置，然后按下列步驟進(jìn)行。 1、如果PLC停止在某些輸出被激勵(lì)的地方，一般是處于中間狀態(tài)，則查找引起下一步操作發(fā)生的信號(hào)（輸入，定時(shí)器，線川，鼓輪控制器等）。 編程器會(huì)顯示那個(gè)信號(hào)的ON/OFF狀態(tài)。 2、如果輸入信號(hào)，將編程器顯示的狀態(tài)與輸入模塊的LED指示作比較，結(jié)果不

18、一致，則更換輸入模塊。入發(fā)現(xiàn)在擴(kuò)展框架上有多個(gè)模塊要更換， 那么，在您更換模塊之前，應(yīng)先檢查I/O擴(kuò)展電纜和它的連接情況。 3、如果輸入狀態(tài)與輸入模塊的LED指示指示一致，就要比較一下發(fā)光二極管與輸入裝置（按鈕、限位開(kāi)關(guān)等）的狀態(tài)。入二者不同，測(cè)量一下輸入 模塊，如發(fā)現(xiàn)有問(wèn)題，需要更換I/O裝置，現(xiàn)場(chǎng)接線或電源；否則，要更換輸入模塊。 4、如信號(hào)是線川，沒(méi)有輸出或輸出與線川的狀態(tài)不同，就得用編程器檢查輸出的驅(qū)動(dòng)邏輯，并檢查程序清單。

19、檢查應(yīng)按從有到左進(jìn)行， 找出第一個(gè)不接通的觸點(diǎn)，如沒(méi)有通的那個(gè)是輸入，就按第二和第三步檢查該輸入點(diǎn)</p><p><b>　　六 常見(jiàn)故障處理</b></p><p>　　查找故障的設(shè)備 SR PLC的指示燈及機(jī)內(nèi)設(shè)備，有益于對(duì)PLC整個(gè)控制系統(tǒng)查找故障。編程器是主要的診斷工具，他能方便地插到PLC上面。在編程器上可以觀察整個(gè)控制系統(tǒng)的狀態(tài)，當(dāng)您去查找PLC為核心

20、的控制系統(tǒng)的故障時(shí)，作為一個(gè)習(xí)慣，您應(yīng)帶一個(gè)編程器。 基本的查找故障順序 提出下列問(wèn)題，并根據(jù)發(fā)現(xiàn)的合理動(dòng)作逐個(gè)否定。一步一步地更換SR中的各種模塊,直到故障全部排除。所有主要的修正動(dòng)作能通過(guò)更換模塊來(lái)完成。 除了一把螺絲刀和一個(gè)萬(wàn)用電表外，并不需要特殊的工具，不需要示波器，高級(jí)精密電壓表或特殊的測(cè)試程序。 1、PWR（電源）燈亮否？如果不亮，在采用交流電源的框架的電壓輸入端（98-162VAC或195-252VAC）檢查電源電壓