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Profibus System Integration PDF 4.03MB - Schneider Electric

Profibus System Integration PDF 4.03MB - Schneider Electric

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The following table summarizes 3 sample calculations:PTQ_PDPMV1 : 768 words IN / 768 words OUTNB masters per PLC(see table above)NB Instruments permaster610 50 125 maxI/O data size on <strong>Profibus</strong>WordsInWordsOutWordsInWordsOutWordsInWordsOut50 25 250 124 625 313Maximum instrumentsper PLC(Instruments x Master)60 300 744 maxThe <strong>Profibus</strong> MNET5204 Coupler on Ethernet Using I/O ScannerThe MNET-5204 gateway exchanges data with the PLC via the I/O scanner, whichhas an I/O data size that differs according to the selected Ethernet coupler. This sizeis used to calculate the number of MNET-5204 masters which can be managed withan Ethernet coupler.The MNET-5204 gateway has an I/O interface for cyclic exchanges of 768 inputwords and 768 output words.As in the previous example, we consider a median number of 2 measurements perinstrument. Because a measurement occupies 2.5 words, we will thus have, for eachinstrument, 5 words for entry and 2.5 words for displaying.For a main MNET-5204 module, the maximum number of instruments will be equal to:768 (I/O dated size) divided by 5 (entry words per instrument) = 153 instrumentsmaximum, however this value is limited to the maximum number of slaves availableon <strong>Profibus</strong>; therefore a total of 124 instruments can be connected.Please note that for this calculation, we use the most important data number,specifically the number for the input data.The following table summarizes the maximum number of instruments and themaximum number of gateways per platform for Premium or Quantum.To carry out these calculations, it is necessary to consider all data exchanged by agateway. The data exchange zone is made up of three parts:43

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