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SolutionsforOEMsFlexibleControlTechnicalTrainingIntroductiontoModbusCommunicationCommunicationParametersIOScannerConfigurationExplicitRequestIntroductiontoModbusCommunicationTwowaystoread/writeinformationfromModbusslavedeviceIOScanning-automaticdataexchanges-onlyconfigurationrequiredExplicitrequests-requiresPOUprogrammingCommunicationParametersCommunicationmanagersmandatorytodefinehardwareinterfacebehaviorTwotypesexist:Fieldbusmanagers-configureconnectedfieldbusdevicesGeneralmanagers1IOScannerConfiguration11Entertriggervariable-RISING_EDGE(1)Definevariablesforcommunicatedregisters(2)Exercise-ModbusIOScanningExplicitRequestDefineModbus_Manager(1)Setconfiguration(2)ExplicitRequest-LibraryExplicitRequest-SlaveAddressExplicitRequest-ReadRequestExplicitRequest-RequestExampleFB“WRITE_VAR”:Writedatatoadevice(max.120words)FB“WRITE_READ_VAR”:Read/writeinonerequestFB“SEND_RECV_MSG”:Send/receivefreemessages(ASCII)Exercise-ExplicitRequest
