PLC機型選擇的基本原則是:在功能滿足要求的前提下,選擇zui可靠、維護使用zui方便以及性能價格比*的機型。通常做法是,在工藝過程比較固定、環(huán)境條件較好的場合,建議選用整體式結(jié)構(gòu)的PLC;其他情況則選用模塊式結(jié)構(gòu)的 PLC;對于開關(guān)量控制以及以開關(guān)量控制為主、帶少量模擬量控制的工程項目中,一般其控制速度無須考慮,因此,選用帶 A/D轉(zhuǎn)換、D/A轉(zhuǎn)換、加減運算、數(shù)據(jù)傳送功能的低檔機就能滿足要求;而在控制比較復(fù)雜,控制功能要求比較高的工程項目中(如要實現(xiàn)PID運算、閉環(huán)控制、通信聯(lián)網(wǎng)等),可視控制規(guī)模及復(fù)雜程度來選用中檔或高檔機(其中高檔機主要用于大規(guī)模過程控制、全PLC的分布式控制系統(tǒng)以及整個工廠的自動化等)。根據(jù)不同的應(yīng)用對象,表1列出了PLC的幾種功能選擇。
IC200ALG263
The analog input module GE Versamax IC200ALG263 is a 15 bit voltage 15 channel single ended that is one group. The GE Versamax is capable of 250vac continuous: 1500vac for 1 minute. The GE Versamax has software-configurable selections of default/hold last state.
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