知識(shí)，因此系統(tǒng)開發(fā)周期短，現(xiàn)場(chǎng)調(diào)試容易。另外，可在線修改程序，改變控制方案而不拆動(dòng)硬件。功能強(qiáng)，性能價(jià)格比高，一臺(tái)小型PLC內(nèi)有成百上千個(gè)可供用戶使用的編程元件，有很強(qiáng)的功能，可以實(shí)現(xiàn)非常復(fù)雜的控制功能。它與相同功能的繼電器系統(tǒng)相比，具有很高的性能價(jià)格比。PLC可以通過通信聯(lián)網(wǎng)，實(shí)現(xiàn)分散控制，集中管理。硬件配套齊全，用戶使用方便，適應(yīng)性強(qiáng)主電路是給異步電動(dòng)機(jī)提供調(diào)壓調(diào)頻電源的電力變換部分，變頻器的主電路大體上可分為兩類：電壓型是將電壓源的直流變換為交流的變頻器，直流回路的濾波是電容。鄭工199 5928 1761
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