OPCOPCOPCAbstract:Inthispaper,OPCtechnologicalprincipleandtwodevelopmentways(directdevelopmentandrapidde-velopment)ofOPCserverareallintroduced,andthespecificapplicationofOPCtechnologyintheDCSofoilfieldun-itedstationisputforward.Keywords:OPCtechnologyPROFIBUS-PAFieldbusDCSInterface