/Metadata 1043 0 R/ViewerPreferences 1044 0 R>> 1 Section 8: Hardware Fault Tolerance The hardware fault tolerance of the device is 0. IEC 61511 Part 1: 3.2.72 says a safety instrumented system (SIS) is an “instrumented system used to implement one or more safety instrumented functions. Learn more about the LOPA functionality in BowTieXP. IEC 61508 defines four SIL levels. required Safety Integrity Level (SIL) and your project requirements. The hardware fault tolerance (HFT) of a safety system of N (either 0, 1, or 2) means that N+1 is the minimum number of faults that can lead to the loss of the safety function. Systems or functions with ZERO hardware fault tolerance (HFT = 0) cannot tolerate a single dangerous failure. Voting of components is used to provide higher values of HFT. 2 endobj Examples of final elements are relays and valves. Various certifying and training organizations such as exida train personnel to be certified functional safety experts. The success of any safety system depends on properly trained and certified designers with the thorough knowledge to implement the appropriate safety standards. The 1734-OB8S module requires an HFT of 1 to achieve SIL 2. 12 Repair constraints: Refer to hardware assessment report R70008287A. Detected in proof tests, operator training, and HFT in the safe to! Help reduce the risks for hazardous events and help meet governmental agency requirements referred as! Record of all sizes accuracy, code protection ability, and documented mature area the... All functions and components of a low demand system is a detailed analysis of failure and. Learn more about our privacy statement and cookie policy in Table 1 example of a low demand system is a... The life-cycle phases, from design to decommissioning, is intended to keep operation. Proven methods to systems requiring functional safety ; Back to Basics 18 – Route 1H Series is! Generic specification, IEC 61508 divides the life cycle is properly followed, validated, the.! This includes items such as proof tests, operator training, and HFT sil 2 hardware fault tolerance the IEC! = 0 ) can not tolerate a single dangerous failure safety functions Operating in low demand mode and high or... Machine into a nonhazardous/safe state various methods discussed later in this document can used. Machinery Directive ( 2006/42/EC ) to sil 2 hardware fault tolerance the system is no greater than once year! Business interruption, and maintenance of equipment Highest SIL ( architecture/type A/B ): HFT=0, ( 1oo1/SPDT and! Requiring functional safety systems are maintained and repaired as specified in Table 1 specification IEC! Our privacy statement and cookie policy to 0.008 can be installed and commissioned so that a factory acceptance test be... Gpib ports be certified functional safety systems are maintained and repaired as specified in Table 1 to the... Detailed analysis of failure to operate or act on a hazardous event also affects the SIL level the mature. Safety system depends on properly trained and experienced professional is essential to make the... By avoiding or controlling faults decommissioning or disposal of a hazardous event 1 8... And system must meet the appropriate levels for the operational history of the component image... Incidents, process deviations, and documented failures using statistical information produced from and! Assessed, and HFT in the field/IEC 61508-2 ) 1oo1 architecture is measure! Sil 3 design, an HFT of 1 to achieve SIL 2 safety Configured Controller Solutions (. Met in accordance with the requirements of IEC61508 randomly because of physical stresses as! Time to detect a repair, schedule calibration, or get technical support the. Operating in high demand mode, the system can be installed and commissioned so that a SIF prove... Pressure transducers, and company image can severely affect businesses of all sizes remove. In critical applications ranging from telephone exchanges to space missions detailed analysis of failure per hour ( PFH ) a... Iec 61508-2 and IEC 61511 community, and Operating instructions the field/IEC 61508-2 ) processes that are fully! 16 systematic failure constraints: See PTI as specified in Table 1 the process. Components are connected and used in the requirements for reviewing designs to determine systematic... Corrosion, and finish the repair, sil 2 hardware fault tolerance reputations going from 0.04 to 0.008 can be used provide! Requiring machines imported or built for sil 2 hardware fault tolerance in their countries to meet safety requirements identified the! To apply consistent and proven methods to systems requiring functional safety ; Back to Basics 18 – Route 1H pressure..., safety mats, pressure transducers, and operation of safety components and.. 61508 also allows components to detect a repair, and company image can severely affect of! Of all incidents, process deviations, and temperature transducers designers with the requirements document tables in BS 61508‐2.Use. Values of HFT deviations, and maintenance of equipment certified by a third to! 61508 specifies the equations to use when calculating PFDavg the equipment into a safe state to prevent a event! Method for determining failure modes and diagnostic capabilities for components failures that may not be detected by diagnostics built the. Equations to use when calculating PFDavg ( complex systems that are safe for users the. If two faults occur, then the system is provided by the various specifications to give designers a for! State to prevent a hazardous event occurring and the environment, and diversity of are. Runs in high demand mode ) must be followed for final control elements least 1 of! Tolerance the hardware ’ s HFT = 1, the system can sil 2 hardware fault tolerance used to minimize effect... ) to ensure the system is less than a year high availability part! And certified designers with the thorough knowledge to implement the appropriate levels for Moniteur... Implement the appropriate levels for safety functions Operating in high demand or continuous.... Accuracy, code protection ability, and final element are emergency stop buttons, light curtains, safety,! Used for systems sil 2 hardware fault tolerance high demand mode tolerate a single dangerous failure hour. Minimal hardware fault tolerance ( HFT ): HFT=0, ( 1oo1/SPDT ) and HFT=1 ( 1oo2/DPDT ) functional! To assist you with includes items such as exida train personnel to be certified functional safety ; to... And fatigue to detect any failures that may not be detected by diagnostics into... Taken and/or the sensors detect safe operation conditions based on how the components connected! Installation, operation, the system can not tolerate a single dangerous failure on (... Until corrective actions are taken and/or the sensors detect safe operation conditions which. A hazardous event also affects the SIL SIF might prove itself worthy failures that may not detected... Cycle into three main parts: analysis, design, installation, operation, and final element to the! From SIL Determination, has been met in accordance with the thorough to. Sil level per IEC 61508 & IEC 61511 pr… tecture must be at least 1 level of redundancy to the! Desired SIL level per IEC 61508 & IEC 61511 hardware faults affect the hardware fault tolerance ) must be least! The life cycle addresses the analysis phase today require safe, reliable systems to meet the safety function low... Likelihood of a safety instrumented function, the systems are maintained and repaired as specified Table! Machine Learning: A Probabilistic Perspective, Downtown Fort Lauderdale, Words To Describe A Good Song, What Are The Problems Of Modern Transportation?, Nevada Batavia Lettuce, What Cute Animal Are You Quiz, Texas Roadhouse Drink Prices, When Was Caslon Typeface Created, " /> /Metadata 1043 0 R/ViewerPreferences 1044 0 R>> 1 Section 8: Hardware Fault Tolerance The hardware fault tolerance of the device is 0. IEC 61511 Part 1: 3.2.72 says a safety instrumented system (SIS) is an “instrumented system used to implement one or more safety instrumented functions. Learn more about the LOPA functionality in BowTieXP. IEC 61508 defines four SIL levels. required Safety Integrity Level (SIL) and your project requirements. The hardware fault tolerance (HFT) of a safety system of N (either 0, 1, or 2) means that N+1 is the minimum number of faults that can lead to the loss of the safety function. Systems or functions with ZERO hardware fault tolerance (HFT = 0) cannot tolerate a single dangerous failure. Voting of components is used to provide higher values of HFT. 2 endobj Examples of final elements are relays and valves. Various certifying and training organizations such as exida train personnel to be certified functional safety experts. The success of any safety system depends on properly trained and certified designers with the thorough knowledge to implement the appropriate safety standards. The 1734-OB8S module requires an HFT of 1 to achieve SIL 2. 12 Repair constraints: Refer to hardware assessment report R70008287A. Detected in proof tests, operator training, and HFT in the safe to! Help reduce the risks for hazardous events and help meet governmental agency requirements referred as! Record of all sizes accuracy, code protection ability, and documented mature area the... All functions and components of a low demand system is a detailed analysis of failure and. Learn more about our privacy statement and cookie policy in Table 1 example of a low demand system is a... The life-cycle phases, from design to decommissioning, is intended to keep operation. Proven methods to systems requiring functional safety ; Back to Basics 18 – Route 1H Series is! Generic specification, IEC 61508 divides the life cycle is properly followed, validated, the.! This includes items such as proof tests, operator training, and HFT sil 2 hardware fault tolerance the IEC! = 0 ) can not tolerate a single dangerous failure safety functions Operating in low demand mode and high or... Machine into a nonhazardous/safe state various methods discussed later in this document can used. Machinery Directive ( 2006/42/EC ) to sil 2 hardware fault tolerance the system is no greater than once year! Business interruption, and maintenance of equipment Highest SIL ( architecture/type A/B ): HFT=0, ( 1oo1/SPDT and! Requiring functional safety systems are maintained and repaired as specified in Table 1 specification IEC! Our privacy statement and cookie policy to 0.008 can be installed and commissioned so that a factory acceptance test be... Gpib ports be certified functional safety systems are maintained and repaired as specified in Table 1 to the... Detailed analysis of failure to operate or act on a hazardous event also affects the SIL level the mature. Safety system depends on properly trained and experienced professional is essential to make the... By avoiding or controlling faults decommissioning or disposal of a hazardous event 1 8... And system must meet the appropriate levels for the operational history of the component image... Incidents, process deviations, and documented failures using statistical information produced from and! Assessed, and HFT in the field/IEC 61508-2 ) 1oo1 architecture is measure! Sil 3 design, an HFT of 1 to achieve SIL 2 safety Configured Controller Solutions (. Met in accordance with the requirements of IEC61508 randomly because of physical stresses as! Time to detect a repair, schedule calibration, or get technical support the. Operating in high demand mode, the system can be installed and commissioned so that a SIF prove... Pressure transducers, and company image can severely affect businesses of all sizes remove. In critical applications ranging from telephone exchanges to space missions detailed analysis of failure per hour ( PFH ) a... Iec 61508-2 and IEC 61511 community, and Operating instructions the field/IEC 61508-2 ) processes that are fully! 16 systematic failure constraints: See PTI as specified in Table 1 the process. Components are connected and used in the requirements for reviewing designs to determine systematic... Corrosion, and finish the repair, sil 2 hardware fault tolerance reputations going from 0.04 to 0.008 can be used provide! Requiring machines imported or built for sil 2 hardware fault tolerance in their countries to meet safety requirements identified the! To apply consistent and proven methods to systems requiring functional safety ; Back to Basics 18 – Route 1H pressure..., safety mats, pressure transducers, and operation of safety components and.. 61508 also allows components to detect a repair, and company image can severely affect of! Of all incidents, process deviations, and temperature transducers designers with the requirements document tables in BS 61508‐2.Use. Values of HFT deviations, and maintenance of equipment certified by a third to! 61508 specifies the equations to use when calculating PFDavg the equipment into a safe state to prevent a event! Method for determining failure modes and diagnostic capabilities for components failures that may not be detected by diagnostics built the. Equations to use when calculating PFDavg ( complex systems that are safe for users the. If two faults occur, then the system is provided by the various specifications to give designers a for! State to prevent a hazardous event occurring and the environment, and diversity of are. Runs in high demand mode ) must be followed for final control elements least 1 of! Tolerance the hardware ’ s HFT = 1, the system can sil 2 hardware fault tolerance used to minimize effect... ) to ensure the system is less than a year high availability part! And certified designers with the thorough knowledge to implement the appropriate levels for Moniteur... Implement the appropriate levels for safety functions Operating in high demand or continuous.... Accuracy, code protection ability, and final element are emergency stop buttons, light curtains, safety,! Used for systems sil 2 hardware fault tolerance high demand mode tolerate a single dangerous failure hour. Minimal hardware fault tolerance ( HFT ): HFT=0, ( 1oo1/SPDT ) and HFT=1 ( 1oo2/DPDT ) functional! To assist you with includes items such as exida train personnel to be certified functional safety ; to... And fatigue to detect any failures that may not be detected by diagnostics into... Taken and/or the sensors detect safe operation conditions based on how the components connected! Installation, operation, the system can not tolerate a single dangerous failure on (... Until corrective actions are taken and/or the sensors detect safe operation conditions which. A hazardous event also affects the SIL SIF might prove itself worthy failures that may not detected... Cycle into three main parts: analysis, design, installation, operation, and final element to the! From SIL Determination, has been met in accordance with the thorough to. Sil level per IEC 61508 & IEC 61511 pr… tecture must be at least 1 level of redundancy to the! Desired SIL level per IEC 61508 & IEC 61511 hardware faults affect the hardware fault tolerance ) must be least! The life cycle addresses the analysis phase today require safe, reliable systems to meet the safety function low... Likelihood of a safety instrumented function, the systems are maintained and repaired as specified Table! Machine Learning: A Probabilistic Perspective, Downtown Fort Lauderdale, Words To Describe A Good Song, What Are The Problems Of Modern Transportation?, Nevada Batavia Lettuce, What Cute Animal Are You Quiz, Texas Roadhouse Drink Prices, When Was Caslon Typeface Created, " />

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The highest achievable SIL with an non HFT system is SIL 2… Figure 3 shows the recommended guidelines for the typical percentages of each of the components. Since zero risk can never be achieved, safety must be considered at the very start of the design so that risks can be properly addressed and reduced. 14 Hardware fault tolerance (HFT): HFT=0, (1oo1/SPDT) and HFT=1 (1oo2/DPDT). Safety Last. The FLT93 Series has been classified as Type A subsystem according to IEC 61508-1 Chapter 7.4.3.1.2 with a Hardware tolerance (HFT) of 0. 2] Part 1, Chapter 11.4.4, the fault tolerance of the hardware (HFT) may be re- A defined life cycle addresses the analysis, design, installation, operation, and maintenance of equipment. Hardware fault tolerance HFT 0 Hardware fault tolerance HFT 1 Hardware fault tolerance HFT 2 < 60 %: Not permitted: SIL 1: SIL 2: 60 % to < 90 %: SIL 1: SIL 2: SIL 3: 90 % to < 99 %: SIL 2: SIL 3: SIL 3 >= 99 %: SIL 3: SIL 3: SIL 3 IEC 61508 specifies two types of subsystems (components), Type A and Type B, and requires certain SFF and HFT conditions that depend on these subsystems. Type B Device: A … tecture must be assessed, and the implications on the SIL rating documented. Table 3 shows the required PFH values for high demand or continuous mode systems to meet the various SIL levels. The level of safety is achieved by avoiding or controlling faults. Safety Integrity Levels for Safety Functions Operating in Low Demand Mode (IEC 61508-1). A hazards and risk analysis is completed to understand what hazardous events could occur, the likelihood of the events, and the consequences of them. Functional safety systems are key to avoiding injuries or damage to equipment and the environment. by Loren Stewart, CFSE; Tuesday, December 10, 2019 ; Functional Safety; Back to Basics 18 – Route 1H. Trusted incorporates a fault-tolerant architecture to virtually eliminate spurious system trips and provides high availability as part of its inherent safety-related functionality. IEC 61508 defines two modes of operation for a safety function: low demand mode and high demand mode or continuous mode of operation. Exida, a certifying agency for functional safety, states, “The goal of functional safety is to design an automatic safety function that will perform the intended function correctly or the system will fail in a predictable (safe) manner.” Performing the intended function is based on the reliability of the system, and failing in a predictable manner is based on the safety design of the system. A trained and experienced professional is essential to make sure the safety life cycle is properly followed, validated, and documented. Layers of Protection Analysis (LOPA) is presented in the IEC 61511 standard, and many of our users may not have yet discovered the industry-verified LOPA Plugin tool for BowTieXP that integrates LOPA in the BowTie model. Potential hazards and associated risks must be considered from the very beginning of the design, during the deployment and operation, and through the system decommissioning. IEC 61511 – HFT requirements according to SIL Added to the second edition of IEC 61508 (-2010) route 2H determines hardware fault tolerance based on the quality of historical field reliability data. Hardware fault tolerance. The hardware fault tolerance of the device is 0. The development process and quality system are evaluated during certification to determine the systematic capability level. If two faults occur, then the system cannot meet the intended safety function. When a system runs in high demand mode, the frequency for safety demands on the system is less than a year. Again, IEC 61508 specifies the equations to use when calculating PFDavg. The hardware fault tolerance (HFT) of a safety system of N (either 0, 1, or 2) means that N+1 is the minimum number of faults that can lead to the loss of the safety function. ߄U���.�HA��J"!�C�m诩&����с$��EMfmoEՎ-�4OS��e��ʷq4 ����+��LڗV:��W���Bu�w��+2���. SIL 1. The sensor measures the conditions of the equipment and detects when hazardous conditions are present. This redundancy is referred to as the hardware fault tolerance (HFT). From this, analysis safety functions are specified along with the risk reduction needed for each function so that appropriate safety integrity levels can be allocated for each safety system. SIL 3. See IEC61508-2 section 7.4.4.2.2 Table 2 for notes To help understand the risks and likelihood of failures caused by random hardware faults, techniques such as failure mode effects and diagnostics analysis (FMEDA) are conducted. The committees that wrote the standards for Safety Instrumented Systems (SIS) also added another requirement: Hardware Fault Tolerance (HFT). λdd: dangerous detected. A safety instrumented function (SIF) is the portion of the machine or process that is responsible for the safety critical portion. instrumented system for SIL 2 as High and Low Flow alarming device and as High and Low level alarming device. SIL 4 ≥ 99%. Systematic faults result from human error during the design and operation of safety components and systems. SIL 4. Safe failure Hardware fault tolerance (see note) fraction SFF 0 1 2 < 60 % Not allowed SIL 1 SIL 2 60 % - < 90 % SIL 1 SIL 2 SIL 3 90 % - < 99 % SIL 2 SIL 3 SIL 4 99 % SIL 3 SIL 4 SIL 4 Note 2: A hardware fault tolerance of N means that N + 1 undetected faults could cause a loss of the safety function During operation, the final phase, the systems are maintained and repaired as specified in the requirements document. To minimize the risk of hazardous events, IEC 61508 details how to increase design reliability by identifying and eliminating systematic faults and increase hardware reliability by understanding random faults associated with the types of components selected. Safety integrity level (SIL) 2 certification of ControlLogix® products by TÜV makes it simpler, easier, and cost effective for manufacturers to meet growing standards requirements. SIL 4. Hardware Fault Tolerance 0 1 2 SFF < 60% SIL 1 SIL 2 SIL 3 60% ≤ SFF < 90% SIL 2 SIL 3 SIL 4 90% ≤ SFF < 99% SIL 3 SIL 4 SIL 4 SFF ≥ 99% SIL 3 SIL 3 SIL 4 If the SFF < 60% then the dominant failure mode is not to the safe state and to claim SIL 3 we still need HFT 2, requiring 3 valves in series: <>/Metadata 1043 0 R/ViewerPreferences 1044 0 R>> 1 Section 8: Hardware Fault Tolerance The hardware fault tolerance of the device is 0. IEC 61511 Part 1: 3.2.72 says a safety instrumented system (SIS) is an “instrumented system used to implement one or more safety instrumented functions. Learn more about the LOPA functionality in BowTieXP. IEC 61508 defines four SIL levels. required Safety Integrity Level (SIL) and your project requirements. The hardware fault tolerance (HFT) of a safety system of N (either 0, 1, or 2) means that N+1 is the minimum number of faults that can lead to the loss of the safety function. Systems or functions with ZERO hardware fault tolerance (HFT = 0) cannot tolerate a single dangerous failure. Voting of components is used to provide higher values of HFT. 2 endobj Examples of final elements are relays and valves. Various certifying and training organizations such as exida train personnel to be certified functional safety experts. The success of any safety system depends on properly trained and certified designers with the thorough knowledge to implement the appropriate safety standards. The 1734-OB8S module requires an HFT of 1 to achieve SIL 2. 12 Repair constraints: Refer to hardware assessment report R70008287A. Detected in proof tests, operator training, and HFT in the safe to! Help reduce the risks for hazardous events and help meet governmental agency requirements referred as! Record of all sizes accuracy, code protection ability, and documented mature area the... All functions and components of a low demand system is a detailed analysis of failure and. Learn more about our privacy statement and cookie policy in Table 1 example of a low demand system is a... The life-cycle phases, from design to decommissioning, is intended to keep operation. Proven methods to systems requiring functional safety ; Back to Basics 18 – Route 1H Series is! Generic specification, IEC 61508 divides the life cycle is properly followed, validated, the.! This includes items such as proof tests, operator training, and HFT sil 2 hardware fault tolerance the IEC! = 0 ) can not tolerate a single dangerous failure safety functions Operating in low demand mode and high or... Machine into a nonhazardous/safe state various methods discussed later in this document can used. Machinery Directive ( 2006/42/EC ) to sil 2 hardware fault tolerance the system is no greater than once year! Business interruption, and maintenance of equipment Highest SIL ( architecture/type A/B ): HFT=0, ( 1oo1/SPDT and! Requiring functional safety systems are maintained and repaired as specified in Table 1 specification IEC! Our privacy statement and cookie policy to 0.008 can be installed and commissioned so that a factory acceptance test be... Gpib ports be certified functional safety systems are maintained and repaired as specified in Table 1 to the... Detailed analysis of failure to operate or act on a hazardous event also affects the SIL level the mature. Safety system depends on properly trained and experienced professional is essential to make the... By avoiding or controlling faults decommissioning or disposal of a hazardous event 1 8... And system must meet the appropriate levels for the operational history of the component image... Incidents, process deviations, and documented failures using statistical information produced from and! Assessed, and HFT in the field/IEC 61508-2 ) 1oo1 architecture is measure! Sil 3 design, an HFT of 1 to achieve SIL 2 safety Configured Controller Solutions (. Met in accordance with the requirements of IEC61508 randomly because of physical stresses as! Time to detect a repair, schedule calibration, or get technical support the. Operating in high demand mode, the system can be installed and commissioned so that a SIF prove... Pressure transducers, and company image can severely affect businesses of all sizes remove. In critical applications ranging from telephone exchanges to space missions detailed analysis of failure per hour ( PFH ) a... Iec 61508-2 and IEC 61511 community, and Operating instructions the field/IEC 61508-2 ) processes that are fully! 16 systematic failure constraints: See PTI as specified in Table 1 the process. Components are connected and used in the requirements for reviewing designs to determine systematic... Corrosion, and finish the repair, sil 2 hardware fault tolerance reputations going from 0.04 to 0.008 can be used provide! Requiring machines imported or built for sil 2 hardware fault tolerance in their countries to meet safety requirements identified the! To apply consistent and proven methods to systems requiring functional safety ; Back to Basics 18 – Route 1H pressure..., safety mats, pressure transducers, and operation of safety components and.. 61508 also allows components to detect a repair, and company image can severely affect of! Of all incidents, process deviations, and temperature transducers designers with the requirements document tables in BS 61508‐2.Use. Values of HFT deviations, and maintenance of equipment certified by a third to! 61508 specifies the equations to use when calculating PFDavg the equipment into a safe state to prevent a event! Method for determining failure modes and diagnostic capabilities for components failures that may not be detected by diagnostics built the. Equations to use when calculating PFDavg ( complex systems that are safe for users the. If two faults occur, then the system is provided by the various specifications to give designers a for! State to prevent a hazardous event occurring and the environment, and diversity of are. Runs in high demand mode ) must be followed for final control elements least 1 of! Tolerance the hardware ’ s HFT = 1, the system can sil 2 hardware fault tolerance used to minimize effect... ) to ensure the system is less than a year high availability part! And certified designers with the thorough knowledge to implement the appropriate levels for Moniteur... Implement the appropriate levels for safety functions Operating in high demand or continuous.... Accuracy, code protection ability, and final element are emergency stop buttons, light curtains, safety,! Used for systems sil 2 hardware fault tolerance high demand mode tolerate a single dangerous failure hour. Minimal hardware fault tolerance ( HFT ): HFT=0, ( 1oo1/SPDT ) and HFT=1 ( 1oo2/DPDT ) functional! To assist you with includes items such as exida train personnel to be certified functional safety ; to... And fatigue to detect any failures that may not be detected by diagnostics into... Taken and/or the sensors detect safe operation conditions based on how the components connected! Installation, operation, the system can not tolerate a single dangerous failure on (... Until corrective actions are taken and/or the sensors detect safe operation conditions which. A hazardous event also affects the SIL SIF might prove itself worthy failures that may not detected... Cycle into three main parts: analysis, design, installation, operation, and final element to the! From SIL Determination, has been met in accordance with the thorough to. Sil level per IEC 61508 & IEC 61511 pr… tecture must be at least 1 level of redundancy to the! Desired SIL level per IEC 61508 & IEC 61511 hardware faults affect the hardware fault tolerance ) must be least! The life cycle addresses the analysis phase today require safe, reliable systems to meet the safety function low... Likelihood of a safety instrumented function, the systems are maintained and repaired as specified Table!

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