【正文】 編程結(jié)束后先空調(diào)程序，待各個動作正常后，再在設(shè)備上調(diào)試。另外，對通信接口、通信協(xié)議、數(shù)據(jù)傳送速度等也要考慮。 PLC的這種模塊化設(shè)計為用戶的產(chǎn)品開發(fā)提供了方便。 對于小的系統(tǒng)，如80點(diǎn)以內(nèi)的系統(tǒng)．一般不需要擴(kuò)展；當(dāng)系統(tǒng)較大時，就要擴(kuò)展。 用圖形編程器編程，該編程器采用梯形圖編程，方便直觀，一般的電氣人員短期內(nèi)就可應(yīng)用自如，但該編程器價格較高。各個公司的開發(fā)軟件都不相同，而用戶程序的存儲容量和指令的執(zhí)行速度是兩個重要指標(biāo)。 ②確定負(fù)載類型根據(jù)PLC輸出端所帶的負(fù)載是直流型還是交流型，是大電流還是小電流，以及PLC輸出點(diǎn)動作的頻率等，從而確定輸出端采用繼電器輸出，還是晶體管輸出，或品閘管輸出。硬件選購目前市場上的PLC產(chǎn)品眾多，除國產(chǎn)品牌外，國外有：日本的 OMRON、MITSUBISHI、FUJJ、ANASONIC, 德國的SIEMENS，韓國的LG等。⑧梯型圖和布爾編程方法。當(dāng)故障被 PLC 邏輯發(fā)現(xiàn)的時候，故障描述在熒屏上出現(xiàn)。 電路的運(yùn)行或運(yùn)行不當(dāng)能被觀察到。編程后的PLC能在辦公室或?qū)嶒炇冶辉u估。④降低費(fèi)用。 PLC有很多的接觸器，假設(shè)一個面板線路繼電器有四個觸點(diǎn),當(dāng)一個設(shè)計需要三個或以上觸點(diǎn)時,所有的都被用了。 當(dāng)使用線路繼電器面板時, 任何的程序改變需要面板和裝置的重寫時間。①強(qiáng)的適應(yīng)性。一個有豐富繼電器邏輯知識的人,在幾天之內(nèi),通過適當(dāng)?shù)闹笇?dǎo)就能掌握先進(jìn)的 PLC 功能。PLC在家用產(chǎn)品和醫(yī)療器材中的非傳統(tǒng)使用已經(jīng)在 1990 年代出現(xiàn)暴長,而且在我們進(jìn)入新的千年將繼續(xù)增長。 一些大的電子學(xué)和計算機(jī)公司和一些不同的企業(yè)電子學(xué)機(jī)構(gòu)發(fā)現(xiàn) PLC 已經(jīng)成為他們最好銷售量的產(chǎn)品。 1970 年代后期, PLC 編程的改進(jìn)使用其成為更方便的使用；在 1978 年，微處理器片的引進(jìn)為各種的自動化 系統(tǒng)增加了計算機(jī)能力而且降低計算機(jī)費(fèi)用。 主要耗時的轉(zhuǎn)換程序之一已經(jīng)是新的配線或者校訂了的繼電器和控制嵌板。在 1960 年代后期和 1970 年代早期內(nèi)從傳統(tǒng)的計算機(jī)進(jìn)展而來的第一個 PLC 系統(tǒng)。今天, 在PLC工業(yè)中的大單位增長就要結(jié)束因為小的變得越來越小。 本質(zhì)上, 一個 PLC 的操作員在一個展覽熒屏之上用一個鍵盤畫梯圖表的線和裝置. 產(chǎn)生的圖畫轉(zhuǎn)換成計算機(jī)機(jī)器語言和作為一個用戶程序運(yùn)行。 When a larger system, we must expand. Different panies products to the total points system and the expansion of the number of modules have limitations when expansion can not meet the requirements, can network structure。 in 1978, the introduction of the microprocessor chip increased puter power for all kinds of automotion systems and lowered the puting cost. Robotics, automotion devices, and puters of all types, including the PLC, consequently underwent many improvements. PLC programs, written in highlevel language, became more understandable to more people, and PLCs became more affordable.In the 1980s, with more puter power per dollar available, the PLC came into exponentially increasing use. Some large electronics and puter panies and some diverse corporate electronics divisions found that the PLC had bee their greatest volume product. The market for PLCs grew from a volume of $80 million in 1978 to $1 billion per year by 1990 and is still growing. Even the machine tool industry, where pute numerical controls (CNCs) have been used in the past, is using PLCs. PLCs are also used extensively in building energy and security control systems. Other nontraditional uses of PLCs, such as in the home and in medical equipment, haved exploded in the 1990s and will increase as we enter the new millennium.A person knowledgeable in relay logic systems can master the major PLC functions in a few hours, These functions might include coils, contacts, timers and counters. The same is true for a person with a digital logic background. For persons unfamiliar with ladder diagrams or digital principles, howere, the learning process takes more time.A person knowledgeable in relay logic can master advanced PLC functions in a few days with proper instruction. Company schools and operating manuals are very helpful in mastering these advanced functions. Advanced functions in order of learning might include sequence/drum controller, register bit use, and more functions.Following are 8 major advantages of using a programmable controller.①Flexibility. In the past, each different electronically controlled production machine required own controller。 15 machines might require 15 different controllers. Now it is possible to use just one model of a PLC to run any one of t