Profibus System Integration PDF 4.03MB - Schneider Electric

InstrumentationspecialistPlant processoperatorMaintenancespecialistControl commandspecialistAsset managementstationSCADAstationHMI ou SCADAstationEngeneering stationDiagnostic sensorMonitoring processMaintenanceConfigurationCalibrationDiagnosticDiagnostic detailProgrammingProcess adjustmentTrend & reportingControlerData acquisitionTreatmentProcess regulationSensorProcessThese services are represented in the preceding diagram. Please note that a majorityof these services are managed via a PLC, and some are accomplished by directaccess to the instruments.The acceptable quality level for these services will determine the types of tools used(Software SCADA, HMI ,etc.) and the choice of the automation architecture.Each of these application services has different characteristics and use differentnetworks mechanisms:• Cyclic for the exchanges of control between the PLC and the instrumentationqualified by:- low volume of information- short response time- high frequency• Acyclic for the majority of the exchanges with the decision makers, qualified by:- high volume of information- longer or non-critical response time- a request or event trigger10