1326AS-B460F-21

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描述

1326AS-B460F-21

?PLC的梯形圖與傳統(tǒng)的電氣原理圖非常相似，信號的輸入/輸出形式及控制功能基本上也是相同的；
? ? 它們的不同之處主要表現(xiàn)在：
? ? （1）控制邏輯——繼電器控制邏輯采用硬接線邏輯，利用繼電器機(jī)械觸點(diǎn)的串聯(lián)或并聯(lián)，及時間繼電器等組合成控制邏輯，其接線多而復(fù)雜、體積大、功耗大、故障率高，靈活性和擴(kuò)展性很差。而PLC采用存儲器邏輯，其控制邏輯以程序方式存儲在內(nèi)存中，靈活性和擴(kuò)展性都很好。
? ? （2）工作方式——繼電器控制線路中各繼電器同時都處于受控狀態(tài)，屬于并行工作方式。而PLC的控制邏輯中，各內(nèi)部器件都處于周期性循環(huán)掃描過程中，各種邏輯、數(shù)值輸出的結(jié)果都是按照在程序中的前后順序計(jì)算得出的，所以屬于串行工作方式。
? ? （3）可靠性和可維護(hù)性——繼電器控制邏輯使用了大量的機(jī)械觸點(diǎn)，連線也多，可靠性和可維護(hù)性差。而PLC采用微電子技術(shù)，大量的開關(guān)動作由無觸點(diǎn)的半導(dǎo)體電路來完成，PLC還配有自檢和監(jiān)督功能，可靠性和可維護(hù)性好。
? ? （4）控制速度——繼電器控制邏輯依靠觸點(diǎn)的機(jī)械動作實(shí)現(xiàn)控制，工作頻率低，且機(jī)械觸點(diǎn)還會出現(xiàn)抖動問題。而PLC是由程序指令控制半導(dǎo)體電路來實(shí)現(xiàn)控制，屬于無觸點(diǎn)控制，速度極快，且不會出現(xiàn)抖動。
? ? （5）定時控制——繼電器控制邏輯利用時間繼電器進(jìn)行時間控制。時間繼電器存在定時精度不高，定時范圍窄，且易受環(huán)境濕度和溫度變化的影響，調(diào)整時間困難等問題。PLC使用半導(dǎo)體集成電路做定時器時基脈沖由晶振產(chǎn)生，精度相當(dāng)高，且定時時間不受環(huán)境的影響，定時范圍廣，調(diào)整時間方便。
? ? （6）設(shè)計(jì)和施工——使用繼電器控制邏輯完成一項(xiàng)工程，其設(shè)計(jì)、施工、調(diào)試必須依次進(jìn)行，周期長、而且修改困難。而用PLC完成一項(xiàng)控制工程，在系統(tǒng)設(shè)計(jì)完成后，現(xiàn)場施工和控制邏輯的設(shè)計(jì)可以同時進(jìn)行，周期短，且調(diào)試和修改都很方便。

產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實(shí)力庫存商家


選擇深圳長欣，選擇放心，售后無憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
主營：本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊”（不管能不能看懂，先了解個大概，以便學(xué)習(xí)編程時查找）；
2、由位控邏輯入手，逐漸增加定時、計(jì)數(shù)等條件，把或、與、非關(guān)系理順；
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)算、類型轉(zhuǎn)換；
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解（最好是有個物理回路驗(yàn)證，比如變頻器+電機(jī)+測速傳感器）；
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制（盡量避免跳轉(zhuǎn)，非跳不可時也是跳的越近越好）；
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列，GE 卡件 模塊 驅(qū)動器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌，由于PLC的基本框架大同小異，學(xué)會一種至于其它的學(xué)習(xí)起來也就簡單了。

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