Schneider Electric 890USE19600 Version 1.0 manual Island Fallback Scenarios, Heartbeat, Message

Page 34

Configuring the Island Bus

Island Fallback Scenarios

Introduction	In the event of a communications failure on the island or between the island and the
	fieldbus, output data is put into a predefined fallback state so that the module’s
	values are known when the system recovers from the failure.
	When you use a basic NIM, you cannot change the fallback parameters of any
	modules in the segment. All output channels on the modules go to a predefined
	fallback value of 0.
Fallback
Fallback	There are several scenarios in which Advantys STB output modules go into their
Scenarios	fallback states:
	loss of fieldbus communications—Communications with the fieldbus master are
	lost.
	loss of island bus communications—There is an internal island bus
	communications error, indicated by a missing heartbeat message from either the
	NIM or a module.
	change of operating state—The NIM may command the island I/O modules to
	switch from a running to a non-running (stopped or reset) state.
	In all of these fallback scenarios, the NIM disables the heartbeat message.

	Note: If a module fails, it needs to be replaced. The module may not go to its
	fallback state.
Heartbeat

	The Advantys STB system relies on a heartbeat message to ensure the integrity and
Message	continuity of communications between the NIM and the island modules. The health
	of island modules and the overall integrity of the Advantys STB system are
	monitored through the transmission and reception of these periodic island bus
	messages.
	Because island I/O modules are configured to monitor the NIM’s heartbeat
	message, output modules will go into their fallback states if they do not receive a
	heartbeat message from the NIM within the defined interval.

34	890USE19600 April 2004

Image 34

Contents Advantys STB 890USE19600 VersionPage Table of Contents Application Example Procedure Safety InformationImportant Information Safety Information Validity Note About the BookAt a Glance Construed as a commitment by Schneider ElectricAbout the Book Summary What’s in this Chapter? IntroductionTopic Island Bus I/O What Is Advantys STB?Introduction BasicWhat Is a Network Interface Module? Structural Outputs in 4 ms About InterbusComponents of a simplified Interbus network are shown below Physical Layer TopologyInput and output data in the masters buffer NodeAddressing On the shift register ring on which data is circulatedIntroduction What’s in this Product specifications of the basic Interbus NIMSTB NIB Basic NIM Module Chapter?Feature Function External Features of the STB NIB 1010 NIMFeatures Called out in the illustration below HardwareSpace reserved for the network connectors NIM housing Fieldbus Port STB NIB 1010 Fieldbus InterfaceSummary ConnectionsNetworking ConnectorsInterbus CableGeneral LED Physical DescriptionOverview IndicationsNIM Activity LEDsPhysical Power Supply InterfaceIsland is the two-receptacle connector illustrated below DescriptionUse either RightLogic Power Improper Galvanic IsolationRequirements CharacteristicsPower Supply ExternalSTB NIB 1010 Module Specifications Technical SpecificationsConfiguring the Island Bus About the Island Basic island configurationAuto-Addressing Bus AddressAn Example Module Physical Location Island Bus AddressConfiguration Auto-ConfigurationAbout Auto Hinged cover Been successfully configured at least onceRST Button StageScenarios Island Fallback ScenariosFallback HeartbeatFieldbus Communications Support Introduction What’s in this Chapter?High Bytes Interbus ID CodeLow Data TypeData Length Objects Data ExchangeData and Status ObjectsWord InternalProcess Image BoundariesExchange Output DataInput Data Contains the NIM statusApplication Example With an Advantys STB NIB 1010 basic NIMFieldbus network Sample Island AssemblyAssembly Sample IslandI/O modules have the following island bus addresses Model Module Type Island Bus AddressConnection Network Configuration ConsiderationsFor use with an Advantys STB island Devices on an Interbus networkSyCon Before YouBegin ConsiderationsStage Description Using SyCon to Configure an STB Island on InterbusWith SyCon Step Action CommentAdd the NIM To add the NIM to the network configurationConfiguring WorkspaceCreate an EDS InstructionsSaving Island slave to your configuration using CMD Using CMD to Configure an STB Island on InterbusCMD Island Slave AddAdding DownloadingApplication Example Glossary ARP BOSComs CanCOB CRCEDS DhcpDIN EIAEOS EMCEMI FedpFsdp GSDIEC BaseScanning IEC type 1 inputInput polarity Industrial I/OInput filtering Input responseContact Energized and open when the coil is energizedEnergized and closed when the coil is energized NemaNIM NMTPDO PDMPLC Consumer model Process I/OProducer Profibus DPScada RTDSAP SDOSmmps SnmpTCP StdpTFE Suppress transient voltage surges UDPVaristor Voltage groupIndex Heartbeat message, 34 housing ID code InterbusIndex