Industrial Communication And Control Protection: RS-485 .
Industrial Communicationand Control Protection:RS-485 and EthernetIndustry 4.0REV0319Littelfuse, Inc. 20191
Over 330M industrial data nodes deployed, and growingWorldwide Market forRS-485 and Ethernet Industrial Nodes200Key FeatureIndustrial EthernetRS-485Capable of drivingMultiple PortsYesYesNoise ImmunityDifferential pairDifferential pairCommon JackRJ45NoFast Speed100Mbps1Gbps10Mbps MaxNetwork CapabilityYesNAPower DeliveryPoE (15.4 W)PoE (30 W)NALong DistanceTransmission100 meters1500 metersIndustrial Nodes Ethernet20192020Source: HMSRS-485 has been historic standard but ethernet has grown due to data transfer capabilitiesLittelfuse, Inc. 20192
Distance and data speed influence protocol selectionRS-485Increased DistanceRemote I/OSecurity SystemEnergy MeterFactory AutomationProgrammableLogic ControllerWind ControlHuman MachineInterfaceTest EquipmentMachine VisionIncreased Data SpeedIndustrial EthernetLittelfuse, Inc. 20193
Environment impacts protection needsIncreased lightningexposureOutdoorEquipmentHuman touch introducesESD riskBuildingControlUnitLong runsincreasesinduced surge ceActuatedValvesMotorControlsElectrical fast transients canbe caused by starting andstopping inductive loadsLegend:Outdoor connection hazardsIntra-building connection hazardsEach port requires protection from exposure to electrical hazards for long term reliabilityLittelfuse, Inc. 20194
Electrical threats to RS-485 and ethernetLightning surgesComm-LinkEquipmentexposedto outdoorsAC PowerLinePower crossLightningLightningInduced lightning surgescan be coupled to industrialdata line causing damage tosensitive ICsEquipmentComm-LinkPower CrossXAC PowerLineInduced power surgeElectrical fast ghtning and power gridswitching can induce powersurge causing damageElectrostatic dischargeIntrabuildingequipmentComm-LinkElectrical Fast Transient(EFT) can be a result ofswitching of inductive loads orrelay contacts “bouncing”Short circuit due to wire aging and installationShort CircuitESDMiswiring during assembly orinsulation damage can causecables be exposed to AC linevoltageESD passing throughconnecter can causedamage to ICsBending radius too tightWires kinked and push togetherRS-485 and Ethernet oftenshare the same conduits withDC or AC power lines; sharpbends and tight wiring tie cangradually result cracks in theinsulation and electrical faultsLittelfuse, Inc. 20195
Intra-building protection recommendations – RS-485RS-485 PortARS-485TransceiverITechnologySeriesIResettable PPTCTRF250/600, TS250,TSV250II*TVS DiodeSM712Note:BIC* Pulse-Guard ESD Suppressors type PGB/XGD are an alternative solution.Applicable Standards: IEC 61000-4-2 (ESD)II IEC 61000-4-4 (EFT) IEC 61000-4-5 (Lightning) ITU K.20 Internal Ports & YD/T 950-1998GND ITU K.21 Internal Ports & YD/T 950-1998 GR 1089 Intra-Building (Type 2) UL 60950-1/IEC60950-1, EN60950-1IResettable PPTC can increase up-time by helping to protect equipment fromshort circuit and power cross event.IITVS Diode Array, SM712, is specifically designed to help protect RS-485applications from ESD, EFT, and lightning induced surges.Littelfuse, Inc. 20196
Outdoor and harsh environments – ySeriesIResettable PPTCTRF250/600, TS250,TSV250IIGDTGTCxxIIISIDACtorPxxx0sApplicable Standards: IEC 61000-4-2 (ESD)GNDIBB IEC 61000-4-4 (EFT) IEC 61000-4-5 (Surge) ITU K.20 Internal Ports & YD/T 950-1998 ITU K.21 Internal Ports & YD/T 950-1998 GR 1089 Intra-Building (Type 2) UL 60950-1/IEC60950-1, EN60950-1IResettable PPTC can increase up-time by helping to protect equipment fromshort circuit and power cross event.IILightning protection utilizing a Gas Discharge Tube, GDT, with SIDACtor.When lightning occurs the SIDACtor will react first causing voltage to increaseacross PPTC until GDT fires. Resistance of PPTC must be selected carefullyfor proper coordination.IIILittelfuse, Inc. 20197
Intra-building protection for EthernetRJ45 ConnectorJ1Ethernet PHYTx TechnologySeriesDiode ArraySRV05xxIApplicable Standards:Tx- IEC 61000-4-2 (ESD) IEC 61000-4-4 (EFT)Rx ITU (ESD Section) GR 1089 (ESD & EFT Sections) YD/T 950 & 1082 UL 60950-1/IEC60950-1, EN60950-1J8RxINote: 1Gbps or greater will require an additional two twistedpair and the diode array solution should be replicated.IPort protected from ESD and EFT. Lightning is not a concern in this application.Low capacitance diode array is needed for high data transmission speeds.Littelfuse, Inc. 20198
Outdoor and harsh environment – EthernetRJ45ConnectorJ1Ethernet PHYTx ITxIIIIIRx J8IIIIIIRx-TechnologySeriesIFuse0461xxxIIGDTSG, CG6, & CG5IIIDiode ArrayLC03xx orSP40xxNote:* PPTC Devise such as T-Line (Telecom Line PPTC)Applicable Standards: IEC 61000-4-2 IEC 61000-4-4 IEC 61000-4-5 ITU K.20, K.21 GR 1089 UL 60950-1/IEC60950-1, EN60950-1Telelink fuses can help protect power fault overcurrent. These fuses aredesigned specifically for high speed telecom applications. A single fuse perwire pair is sufficient.Lightning protection utilizes GDT with diode array to meet standardrequirements. Class rating and external wiring configuration will determinespecific protection needed but an example would be(4kV/2kA,1.2/50µs-8/20µs) .Littelfuse, Inc. 20199
Lightning, ESD, and power fault protection – PoEF1RJ451TechnologySeriesI*Fuse0461xxxIITVS DiodeSMCJxxCA247Note:* PPTC Devise such as T-Line (Telecom Line PPTC )II5II IEC 61000-4-2 (ESD)I IEC 61000-4-4 (EFT) IEC 61000-4-5 (Class 0-4)8 ITU K.20 Internal Ports & YD/T 950-199836IIIApplicable Standards: ITU K.21 Internal Ports & YD/T 950-1998F8 GR 1089 Intra-Building (Type 2) UL 60950-1/IEC60950-1, EN60950-1Telelink fuses can help protect power fault overcurrent. These fuses aredesigned specifically for high speed telecom applications.A single TVS diode (bi-directional) across the center tap signal pair andsecond TVS diode across the center tap spare pair. The TVS diode can bechosen based surge requirements for 400W, 600W, 1500W or 3000W.Littelfuse, Inc. 201910
Key links Ethernet Protection Design Guide:https://www.littelfuse.com/ /media/electronics/design guides/esd/littelfuse ethernet protection design guide.pdf.pdf Fuseology Selection Guide:https://www.littelfuse.com/ /media/electronics/product catalogs/littelfuse fuseology selection guide.pdf.pdf Electrostatic Discharge (ESD) Suppression Design Guide:https://www.littelfuse.com/ /media/electronics/design guides/esd/littelfuse esd suppression design guide.pdf.pdf Electronic Discharge (ESD) Protection Design Guide:https://www.littelfuse.com/ /media/electronics/design guides/esd/littelfuse esd protection design guide.pdf.pdf Circuit Protection Solutions:https://www.littelfuse.com/ /media/electronics/product catalogs/littelfuse product selection guide.pdf.pdf Generalwww.littelfuse.comLittelfuse, Inc. 201911
Reliability requires industrial communication protection RS-485 and ethernet nodes are projected to expand to 330 million by 2020 RS-485 is generally used for longer-distance communication & control links Industrial Ethernet is most suitable where fast data transmission is needed Equipment environment and standards will determine required protection Lightning, ESD, EFT, inductive surges, and shorts are potential threats Fuses, PPTCs can be used for overcurrent protection and TVS diodes, GDTs,and SIDACtors can be used for overvoltage protection.Littelfuse, Inc. 201912
Littelfuse.comLittelfuse, Inc. 201813
Reliability requires industrial communication protection RS-485 and ethernet nodes are projected to expand to 330 million by 2020 RS-485 is generally used for longer-distance communication & control links Industrial Etherne
Contents Product Selection 1 Overview/Applications 2 Operating Programs 3 Communication 4 Overcurrent Protection 5 Distance Protection 6 Line Differential Protection 7 Transformer Differential Protection 8 Busbar Differential Protection 9 Relays for Various Protection Applications 10 Generator Protection 11 Substation Automation 12 Relay Communication Equipment 13 Test Equipment and Accessories 14
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