描述
一般情況下,變頻器通過操作面板(PU)來設(shè)置變頻器參數(shù),一旦參數(shù)設(shè)定好了,就不能改變,這樣很難通過現(xiàn)場信號進(jìn)行實(shí)時(shí)的控制。通過以上對變頻器通信協(xié)議的分析,考慮用軟件來實(shí)現(xiàn)工控機(jī)與變頻器的串行通信,利用軟件可以靈活的實(shí)現(xiàn)系統(tǒng)所需的各種功能而不必改動(dòng)現(xiàn)場的硬件電路,而且RS-485通信線最多能同時(shí)控制32臺變頻器,同時(shí),各變頻器的運(yùn)行狀態(tài)也能實(shí)時(shí)地回送給上位機(jī)。
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