1746-OV32

1746-OV32

S7-200的PLC常用的編程元件主要包括數(shù)字量輸入繼電器(I)、數(shù)字量輸出繼電器(Q)、特殊標志繼電器(SM)、輔助繼電器(M)等。

系統(tǒng)采用的西門子7.5KW變頻器，考慮到電網(wǎng)的頻率、變頻器和電機工作頻率等多方面的因素，把50HZ設(shè)定為電機運行時頻率可調(diào)的大值，將20HZ設(shè)置為電機運行時頻率可調(diào)的小值，由于在變頻調(diào)速中調(diào)節(jié)電機的頻率不會降至0HZ，所以小頻率為20HZ，也是執(zhí)行減泵操作的界限。

變頻器與PLC的通信可采用西門子USS通信協(xié)議實現(xiàn)。其在工作過程中，由USS主站發(fā)出通信的信號，且不停地查詢每個從站，從站在收到數(shù)據(jù)命令之后，判斷能否執(zhí)行和怎么執(zhí)行。

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1797BOOT

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1797IBN16

1797IE8

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1797IJ2

1797INS

1797IRT8

1797OB4D

1797OE8

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1797PS2E2

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1797RPA

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1797TCAP

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1797TPS

1797TPYR

1797TPYS

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1799AUXCON

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1799COV32

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1799DNC5MMS

1799DNETCON

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1799DSCCON

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1799MP20

1799MP32

1799ZCIOB

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