6ES7902-1AB00-0AA0 RS232電纜

PlC和變頻器通訊方式

1、PLC的開關量信號控制變頻器

PLC（MR型或MT型）的輸出點、COM點直接與變頻器的STF（正轉啟動）、RH（高速）、RM（中速）、RL（低速）、輸入端SG等端口分別相連。PLC可以通過程序控制變頻器的啟動、停止、復位；也可以控制變頻器高速、中速、低速端子的不同組合實現(xiàn)多段速度運行。但是，因為它是采用開關量來實施控制的，其調(diào)速曲線不是一條連續(xù)平滑的曲線，也無法實現(xiàn)的速度調(diào)節(jié)。

2、PLC的模擬量信號控制變頻器

硬件：FX1N型、FX2N型PLC主機，配置1路簡易型的FX1N-1DA-BD擴展模擬量輸出板；或模擬量輸入輸出混合模塊FX0N-3A；或兩路輸出的FX2N-2DA；或四路輸出的FX2N-4DA模塊等。優(yōu)點：PLC程序編制簡單方便，調(diào)速曲線平滑連續(xù)、工作穩(wěn)定。

缺點：在大規(guī)模生產(chǎn)線中，控制電纜較長，尤其是DA模塊采用電壓信號輸出時，線路有較大的電壓降，影響了系統(tǒng)的穩(wěn)定性和可靠性。

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