6ES7351-1AH01-0AE0通訊適配器對各變頻器的操作在軟件上實現(xiàn)過程如下:DP主站向通信適配器發(fā)送數(shù)據(jù),通信適配器在接收到數(shù)據(jù)后,對其進(jìn)行解析,然后根據(jù)所連接的變頻器類型,把數(shù)據(jù)重新封裝成標(biāo)準(zhǔn)MODBUS格式或者USS格式發(fā)送給變頻器,變頻器在接收到數(shù)據(jù)后,回送響應(yīng)信息,完成相應(yīng)的操作,通信適配器再將接收到的響應(yīng)信息重新解析封裝成PROFIBUS-DP格式,然后回送給主站。這樣,一次操作完成。
6ES7351-1AH01-0AE0
假設(shè)對于站地址為05的ACS400系列變頻器,要求其EXT1運行頻率為5Hz,則主站向通信適配器發(fā)送數(shù)據(jù)交換報文,通訊適配器解析出報文中的數(shù)據(jù)單元DU如下:控制字,04H、7FH;給定1,07H、D0H;給定2,00H、00H;未用,00H、00H。假設(shè)此時使用的數(shù)據(jù)長度為8字節(jié)(實際中還可使用12字節(jié)),變頻器的通信參數(shù)已進(jìn)行正確設(shè)定。
通信適配器在對此數(shù)據(jù)單元進(jìn)行分析后,向變頻器發(fā)送如下格式所示的數(shù)據(jù):地址,05H;命令,06H;寄存器代碼,000 1 H ;數(shù)據(jù),07D0H;CRC,DA22H。變頻器接收到數(shù)據(jù)后回送的響應(yīng)數(shù)據(jù)為:地址,05H;命令,06 H ;寄存器代碼,000 1 H ;數(shù)據(jù),07DOH;CRC,DA22H。且完成相應(yīng)的操作。
由于USS協(xié)議與MODBUS協(xié)議不兼容, 主站在對西門子MIDIMASTER變頻器進(jìn)行操作時,本通信適配器所收發(fā)送數(shù)據(jù)格式是不同的。例如,對于站地址為03的西門子MIDIMASTER變頻器,要求改變其運行頻率為25Hz。則本通信適配器在對主站發(fā)出的數(shù)據(jù)交換報文進(jìn)行解析后,向變頻器發(fā)送如下的數(shù)據(jù):STx,02H;LGE,0CH ;ADR,03H ;PKE ,0000H ;IDN ,0000H ;VAL,0000H lSTW ,0C7FH ;HSW ,2000H;BCC,5EH。變頻器在接收到數(shù)據(jù)后,回送如下響應(yīng)數(shù)據(jù)為:STx,02H ;LGE,0CH ;ADR ,03H ;PKE,0000H lIDN ,0000H lV AL,0000H lSTW ,0C7FH ;HSW ,2000H IBCC,5EH。且完成相應(yīng)操作。
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