aeg 120-108-005

控制性能

可以分為高檔機(jī)、中檔機(jī)和低檔機(jī)。

低檔機(jī)

這類可編程序控制器，具有基本的控制功能和一般的運(yùn)算能力。工作速度比較低，能帶的輸入和輸出模塊的數(shù)量比較少。

比如，德國(guó)siemens公司生產(chǎn)的s7-200就屬于這一類。

中檔機(jī)

這類可編程序控制器，具有較強(qiáng)的控制功能和較強(qiáng)的運(yùn)算能力。它不僅能完成一般的邏輯運(yùn)算，也能完成比較復(fù)雜的三角函數(shù)、指數(shù)和pid運(yùn)算。工作速度比較快，能帶的輸入輸出模塊的數(shù)量也比較多，輸入和輸出模塊的種類也比較多。

比如，德國(guó)siemens公司生產(chǎn)的s7-300就屬于這一類。

高檔機(jī)

這類可編程序控制器，具有強(qiáng)大的控制功能和強(qiáng)大的運(yùn)算能力。它不僅能完成邏輯運(yùn)算、三角函數(shù)運(yùn)算、指數(shù)運(yùn)算和pid運(yùn)算，還能進(jìn)行復(fù)雜的矩陣運(yùn)算。工作速度很快，能帶的輸入輸出模塊的數(shù)量很多，輸入和輸出模塊的種類也很全面。這類可編程序控制器可以完成規(guī)模很大的控制任務(wù)。在聯(lián)網(wǎng)中一般做主站使用。

比如，德國(guó)siemens公司生產(chǎn)的s7-400就屬于這一類。

結(jié)構(gòu)

整體式

整體式結(jié)構(gòu)的可編程序控制器把電源、cpu、存儲(chǔ)器、i/o系統(tǒng)都集成

plc結(jié)構(gòu)

plc結(jié)構(gòu)

在一個(gè)單元內(nèi)，該單元叫做作基本單元。一個(gè)基本單元就是一臺(tái)完整的plc。

控制點(diǎn)數(shù)不符合需要時(shí)，可再接擴(kuò)展單元。整體式結(jié)構(gòu)的特點(diǎn)是非常緊湊、體積小、成本低、安  裝方便。

組合式

組合式結(jié)構(gòu)的可編程序控制器是把plc系統(tǒng)的各個(gè)組成部分按功能分成

plc組合

plc組合

若干個(gè)模塊，如cpu模塊、輸入模塊、輸出模塊、電源模塊等等。其中各模塊功能比較單一，模塊的種類卻日趨豐富。比如，一些可編程序控制器，除了－些基本的i/o模塊外，還有一些特殊功能模塊，像溫度檢測(cè)模塊、位置檢測(cè)模塊、pid控制模塊、通訊模塊等等。組合式結(jié)構(gòu)的plc特點(diǎn)是cpu、輸入、輸出均為獨(dú)立的模塊。模塊尺寸統(tǒng)一、安  裝整齊、i/o點(diǎn)選型自由、安  裝調(diào)試、擴(kuò)展、維修方便。

疊裝式

疊裝式結(jié)構(gòu)集整體式結(jié)構(gòu)的緊湊、體積小、安  裝方便和組合式結(jié)構(gòu)的i/o點(diǎn)搭配靈話、安  裝整齊的優(yōu)點(diǎn)于一身。它也是由各個(gè)單元的組合構(gòu)成。其特點(diǎn)是cpu自成獨(dú)立的基本單元（由cpu和一定的i/o點(diǎn)組成），其它i/o模塊為擴(kuò)展單元。在安  裝時(shí)不用基板，僅用電纜進(jìn)行單元間的聯(lián)接，各個(gè)單元可以一個(gè)個(gè)地疊裝。使系統(tǒng)達(dá)到配置靈活、體積小巧。

manufacturer p/n

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