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Kollmorgen 6SM56-S3000-G控制擴(kuò)充模塊庫(kù)存

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Kollmorgen 6SM56-S3000-G控制擴(kuò)充模塊庫(kù)存

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Kollmorgen 6SM56-S3000-G控制擴(kuò)充模塊庫(kù)存 Kollmorgen 6SM56-S3000-G控制擴(kuò)充模塊庫(kù)存 Kollmorgen 6SM56-S3000-G控制擴(kuò)充模塊庫(kù)存 Kollmorgen 6SM56-S3000-G控制擴(kuò)充模塊庫(kù)存
在分析繼電器控制邏輯或者模擬電路時(shí),只需要考慮信號(hào)之間的相互關(guān)系,很少考慮先后順序,因?yàn)樵谶@些系統(tǒng)里,信號(hào)是以光速傳播的,結(jié)果會(huì)立即生效,將結(jié)果反饋給前端進(jìn)行輸入,沒(méi)有延遲。
但是,對(duì)于PLC來(lái)說(shuō),它的核心是一個(gè)CPU。和所有的計(jì)算機(jī)一樣,程序指令的執(zhí)行是有先后順序的,并且是一遍一遍循環(huán)掃描的。在一次掃描的過(guò)程中,后續(xù)的結(jié)果不能立即被前面的程序所使用的,必須等到下一次掃描,才能有效。因此,編制PLC程序時(shí),尤其是復(fù)雜邏輯時(shí),必須有清晰的時(shí)序概念(時(shí)序,就是按照時(shí)間先后順序的意思)。學(xué)習(xí)PLC時(shí),時(shí)序是一塊重要內(nèi)容。
舉個(gè)排水泵自動(dòng)控制的例子(僅給出自動(dòng)相關(guān)的I/O點(diǎn)),其工作原理:輸入有低液位和高液位兩個(gè)開關(guān)信號(hào)(都用浮子開關(guān)檢測(cè),浮子抬起時(shí),信號(hào)為高電平,低頭時(shí),信號(hào)為低電平),輸出為泵啟動(dòng)的信號(hào)。PLC里梯形圖只用一段簡(jiǎn)單程序就可以實(shí)現(xiàn)高液位啟動(dòng),低液位停止的功能,其邏輯和工作時(shí)序,如圖1所示。
圖1 水泵邏輯及工作時(shí)序圖
對(duì)于PLC的調(diào)試,首先要用PLC編程軟件。這些編程軟件都能夠監(jiān)控各個(gè)變量、程序圖的狀態(tài),這是基本功能,否則是不能進(jìn)行調(diào)試的。對(duì)于大部分慢的、簡(jiǎn)單的邏輯,編程軟件的基本功能就足夠完成調(diào)試任務(wù)。
但是,如果邏輯比較復(fù)雜,跨很多頁(yè)面,或者信號(hào)變化很快,單靠肉眼觀察實(shí)時(shí)狀態(tài),并進(jìn)行邏輯思考,是非常困難的。編程軟件大部分會(huì)提供變量監(jiān)控表,將需要關(guān)心的變量都放進(jìn)去,點(diǎn)擊監(jiān)控,即可實(shí)時(shí)刷新狀態(tài),這可以一定程度解決大量變量監(jiān)控的問(wèn)題。但是,對(duì)于復(fù)雜邏輯或者變化速度較快的程序,就需要借助時(shí)序圖的工具,將變化過(guò)程記錄下來(lái),在事后慢慢分析。
還說(shuō)上面水泵控制的簡(jiǎn)單例子,如果遇到一個(gè)現(xiàn)象,水泵啟動(dòng)后,偶爾會(huì)在到達(dá)低液位前停止,什么原因呢?可能是低液位信號(hào)抖動(dòng),也可能是輸出的接線松動(dòng)等,這時(shí)候如果能得到當(dāng)時(shí)的時(shí)序圖,就很容易判斷了。如果時(shí)序圖如圖2所示,我們就可以判斷是低液位信號(hào)不可靠導(dǎo)致,去檢查低液位信號(hào)的接線或者浮子開關(guān)即可。如果時(shí)序圖如圖3所示,則需要檢查控制命令的輸出接線和電機(jī)主回路。
可惜,大部分的編程軟件是不提供時(shí)序圖功能的。還好,現(xiàn)在有一些第三方的錄波軟件,可以實(shí)現(xiàn)時(shí)序錄波功能。第三方通用錄波軟件是指那些非PLC廠家開發(fā)的,能對(duì)多種PLC進(jìn)行連續(xù)錄波的軟件(有些只能對(duì)單一PLC進(jìn)行錄波),比較常見的是PLC-ANALYZER、IBA。這兩個(gè)軟件都是國(guó)外的軟件,價(jià)格貴,無(wú)免費(fèi)使用部分。一般PLC工程師無(wú)法承受。國(guó)內(nèi)也出現(xiàn)了一些與IBA類似的錄波軟件,比如京城瑞達(dá)的錄波軟件For many years, automatic sputtering equipment has been the application field of baccalais controller. In the latest design, the centralized X20 CPU of baccalais is responsible for controlling more than 20 servo drives and a large number of valve islands of the whole equipment. About two years ago, Miba developed a brand-new system for larger parts processing. At that time, they decided to develop an automated system with safety functions. "Although the automation scheme has been used for 10 years, we only need to make some minor changes to the system with software," said Gerald hochmuth, software development engineer of Miba happily. The system development was completed in just a few months, including a brand-new display system. "However, for us, the most important change in the system is the seamless integration of security technologies." This is very important because if the vacuum chamber seal leaks, the cathode high voltage must be interrupted and grounded quickly and smoothly. The safety I / O module on the X20 I / O node is connected to the centralized safety CPU through the Powerlink communication bus and monitors the system. No discrete wiring can speed up system debugging, and a wide range of diagnostic functions can also improve system response speed in case of system errors.
The system is simplified because it does not require a lot of wiring and has additional diagnostic and remote maintenance functions. The error information of all modules can be easily viewed in the system logbook in automation studio. Of course, the information can also be obtained through remote access. This not only increases the system's ease of use, but also improves the system's response speed and greatly enhances the system's availability.