SEW MPB51A055-503-00

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描述

SEW MPB51A055-503-00

省時性（運(yùn)行成本低）
程序簡短可以節(jié)省程序運(yùn)行時間，但簡短與省時并不完全是一回事，因?yàn)檫\(yùn)行程序時間雖與程序所擁有指令條數(shù)有關(guān)，而且還與所使用的是什么指令有關(guān)，PLC指令不同，執(zhí)行的時間也不同，而且，有的指令在邏輯條件ON時執(zhí)行與在OFF時執(zhí)行其時間也不同，另外，由于使用了流程控制指令，在程序中不是所有指令都要執(zhí)行等。所以運(yùn)行程序的時間計(jì)算是較復(fù)雜的，但要求其平均時間少，最大時間也不太長是必要的，這樣可提高PLC的響應(yīng)速度。省時的關(guān)鍵是用好流程控制指令，按情況確定一些必須執(zhí)行的指令，作必備部分，其余的可依程序進(jìn)行，有選擇地執(zhí)行，或作些分時工作的設(shè)計(jì)，避免最大時間太長等。
繼承性（變動成本低）
要使程序具有繼承性，那就是要便于修改和移植。PLC的特點(diǎn)之一就是方便，可靈活地適用于各種情況，其辦法就是靠修改或重新設(shè)計(jì)程序，重新設(shè)計(jì)程序用于PLC工藝用途已經(jīng)更改的情況，不僅程序重編，而且I/O也要重新分配，即便如此，很多獨(dú)立功能的子程序依然可以適用于不同的工藝控制；對于相同或類似的工藝控制，多數(shù)情況下不需要重編程序，作一些修改就可以了。這就要求程序具有繼承性，具有方便快捷的通用性接口，便于參數(shù)修改和程序的移植。

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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Enlarge
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PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅

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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