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Ci file GSD chnh l ci th vin, nhiu bn c hi ti cc hm truyn thng. y ti thy cc bn khng nm r ht tnh nng nht l Siemens PLC n coi mt phn t trn mng profibus cng chnh l phn t c b nh m PLC qun l c ging nh l M, I, Q ... v y c tn l PIW/PQW, PID/PQD (P=Peripheral hay thit b ngoi vi). Bn khng cn mt hm truyn thng h tr sn bn c th dng hm move cng c vy. Ch cn bn hiu thit b ngoi vi c vng nh th no, bit no l on, bit nao off ... bn vit chng trnh trn PLC ri sau mov chng ti a ch ny l xong.
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