Siemens OSM, ESM Functions, Increased Network Performance, Learning Addresses

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Functions

Functions

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This chapter discusses the general functions of the OSM/ESM, in particular the properties of the switching technology.

Increased Network Performance

By filtering the data traffic based on the Ethernet (MAC) address of the DTEs, local data traffic remains local, only data intended for nodes in another network segment are passed on by the OSM or ESM. This reduces the data traffic in the network segments and lowers the network load in the network segments.

Simple Network Configuration and Network Expansion

OSMs and ESMs store the data received at the ports and the direct it to the destination address. The restriction of the network span resulting from collision detection (CSMA/CD) ends at the OSM/ESM port. With multimode graded-index fibers, a total network span of up to 150 km and more can be achieved without problems. With the OSM ITP62-LD, the monomode fibers allow a network span of up to 1300 km.

Limitation of Errors to the Network Segment Affected

OSMs and ESMs only pass on valid data. Invalid packets are discarded so that bad packets within a network segment have no effect on any other segment attached to the OSM/ESM.

Learning Addresses

By evaluating the source addresses in the data packets, OSMs/ESMs automatically learn the addresses of the DTEs attached via a particular port. If an OSM/ESM receives a data packet, it directs this packet only to the port via which the appropriate DTE can be obtained.

An OSM/ESM can learn up to 7000 addresses.

Industrial Ethernet OSM/ESM

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C79000-Z8976-C068-10

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Contents Simatic NET Copyright Siemens AG 2000/02, All rights reserved Classification of Safety-Related NoticesTrademarks Safety Instructions Regarding your ProductQualified Personnel Correct Usage of Hardware ProductsPrior to Startup Correct Usage of Software ProductsPreface Installing an OSM/ESMPurpose of the Operating Instructions PackageFinding Information Validity of the Operating InstructionsFurther Documentation Audience Guide to the ManualPersonnel Qualification Requirements Standards and ApprovalsContents Introduction Introduction Possible Attachments Overview of the Variants of the OSM/ESMOSM ITP62 Properties of the OSM ITP62 OSM ITP62-LD OSM ITP62-LDITP62-LD Properties of the OSM ITP62-LDOSM ITP53 OSM ITP53Properties of the OSM ITP53 ESM ITP80 ESM ITP80Properties of the ESM ITP80 OSM TP62 OSM TP62Properties of the OSM TP62 ESM TP80 ESM TP80Properties of the ESM TP80 OSM BC08 OSM BC08Properties of the OSM BC08 OSM TP22 OSM TP22Properties of the OSM TP22 ESM TP40 ESM TP40Properties of the ESM TP40 Limitation of Errors to the Network Segment Affected Simple Network Configuration and Network ExpansionFunctions Increased Network PerformancePackets with the Vlan Priority Tag Setting the Transmission Rate, AutonegotiationDeleting Addresses Functions Network Topologies with OSM/ESM Bus with OSM Bus StructureBus with ESMs Redundant Ring Structure with OSMs Redundant Ring StructureESM in RM mode Redundant Coupling of Network Segments OSM/ESM Replacing the Standby Master During Operation Port Assignment in the Standby ModeSimultaneous Standby and Redundancy Manager Operation OSM RM mode Compatibility Compatibility of OSM Version 2/ESM with OSM/ORM VersionRing with OSM Version 2 as Redundancy Manager Redundant Coupling of Rings Standby Master Slave OSM Coupling Network Segments OSM RM modeInterfaces, Displays and Operator Controls TP Ports ITP/TP PortsITP Ports Properties of the TP/ITP Ports Autonegotiation ModeLink Control Auto Polarity ExchangeInterfaces, Displays and Operator Controls FO Ports Standby-Sync Port Pinout Serial InterfaceTerminal Block for the Power Supply and Signaling Contact RM Mode additional Power SupplySignaling Contact OSM/ESM in the Standby Mode Input voltage must not exceed +30V DC or fall below -30V DC Digital InputsDisplays and Operator Controls Fault red LEDLED Display Status Stby Standby green LEDRM Redundancy Manager green LED Display mode Meaning LED PowerFault Mask Display Port LEDsFull duplex Port LED DIP Switches Two-Pin DIP SwitchSelect/Set Button Installation, Commissioning, Cleaning Maintenance Unpacking, Checking the Consignment Do not install damaged componentsPreparations InstallationStandard Rail Mounting Installing the OSM on a DIN Standard RailRemoving from the Standard Rail Removing from a Standard RailInstallation on the S7-300 Rail Installation on a Simatic S7-300 RailInstallation in the 19 Cubicle Installation in Pairs in the 19 CubicleWall Mounting Wall MountingWall Mounting Cleaning Maintenance Specifying the keyword OSM Firmware Firmware UpdateFirmware Update Firmware Update Firmware Update Firmware Update Ports Technical SpecificationsTechnical Specifications Cascading Depth Switching Properties of OSM/ESMPermitted Cable Lengths Permitted Ambient Conditions/EMC Only horizontal installationMechanical Design PermittedConsignment / Order Numbers Accessories CE Mark Standards and ApprovalsProduct name Approval for Australia Area of ApplicationUL Approval CSA CertificationFM Approval Adherence to Installation Instructions Glossary Fault Mask Filtering ITP PortTP Port LatencyLink Control Industrial Ethernet OSM/ESM C79000-Z8976-C068-10 Http//www4.ad.siemens.de/view/cs/de/8677203 ReferencesIndustrial Ethernet OSM/ESM C79000-Z8976-C068-10 Ambient conditions, permitted IndexIndex