選擇型號編輯
PLC產(chǎn)品的種類繁多。PLC的型號不同，對應(yīng)著其結(jié)構(gòu)形式、性能、容量、指令系統(tǒng)、編程方式、價(jià)格等均各不相同，適用的場合也各有側(cè)重。因此，合理選用PLC，對于提高PLC控制系統(tǒng)的技術(shù)經(jīng)濟(jì)指標(biāo)有著重要意義。
PLC機(jī)型的選擇
PLC的選擇主要應(yīng)從PLC的機(jī)型、容量、I/O模塊、電源模塊、特殊功能模塊、通信聯(lián)網(wǎng)能力等方面加以綜合考慮。PLC機(jī)型選擇的基本原則是在滿足功能要求及保證可靠、維護(hù)方便的前提下，力爭最佳的性能價(jià)格比。選擇時(shí)應(yīng)主要考慮到合理的結(jié)構(gòu)型式，安裝方式的選擇，相應(yīng)的功能要求，響應(yīng)速度要求，系統(tǒng)可靠性的要求，機(jī)型盡量統(tǒng)一等因素。
一、合理的結(jié)構(gòu)型式
PLC主要有整體式和模塊式兩種結(jié)構(gòu)型式。
整體式PLC的每一個(gè)I/O點(diǎn)的平均價(jià)格比模塊式的便宜，且體積相對較小，一般用于系統(tǒng)工藝過程較為固定的小型控制系統(tǒng)中；而模塊式PLC的功能擴(kuò)展靈活方便，在I/O點(diǎn)數(shù)、輸入點(diǎn)數(shù)與輸出點(diǎn)數(shù)的比例、I/O模塊的種類等方面選擇余地大，且維修方便，一般于較復(fù)雜的控制系統(tǒng)。

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