選擇型號編輯
PLC產品的種類繁多。PLC的型號不同，對應著其結構形式、性能、容量、指令系統、編程方式、價格等均各不相同，適用的場合也各有側重。因此，合理選用PLC，對于提高PLC控制系統的技術經濟指標有著重要意義。
PLC機型的選擇
PLC的選擇主要應從PLC的機型、容量、I/O模塊、電源模塊、特殊功能模塊、通信聯網能力等方面加以綜合考慮。PLC機型選擇的基本原則是在滿足功能要求及保證可靠、維護方便的前提下，力爭最佳的性能價格比。選擇時應主要考慮到合理的結構型式，安裝方式的選擇，相應的功能要求，響應速度要求，系統可靠性的要求，機型盡量統一等因素。
一、合理的結構型式
PLC主要有整體式和模塊式兩種結構型式。
整體式PLC的每一個I/O點的平均價格比模塊式的便宜，且體積相對較小，一般用于系統工藝過程較為固定的小型控制系統中；而模塊式PLC的功能擴展靈活方便，在I/O點數、輸入點數與輸出點數的比例、I/O模塊的種類等方面選擇余地大，且維修方便，一般于較復雜的控制系統。

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