Safety Considerations Guide, Tricon v9.0 - Tuv-fs.com

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4 Safety OverviewSIS FactorsSIL FactorsAccording to the ANSI/ISA S84.01 and IEC 61508 standards, the scope of an SISis restricted to the instrumentation or controls that are responsible for bringing aprocess to a safe state in the event of a failure. The availability of an SIS isdependent upon:• Failure rates and modes of components• Installed instrumentation• Redundancy• Voting• Diagnostic coverage• Testing frequencyA SIL can be considered a statistical representation of the availability of an SIS atthe time of a process demand. A SIL is the litmus test of acceptable SIS design andincludes the following factors:• Device integrity• Diagnostics• Systematic and common cause failures• Testing• Operation• MaintenanceIn modern applications, a programmable electronic system (PES) is used as thecore of a SIS. The Triconex controller is a state-of-the-art PES optimized forsafety-critical applications.Tricon Safety Considerations Guide
Hazard and Risk Analysis 5Hazard and Risk AnalysisIn the United States, OSHA Process Safety Management (PSM) and EPA RiskManagement Program (RMP) regulations dictate that a PHA be used to identifypotential hazards in the operation of a chemical process and to determine theprotective measures necessary to protect workers, the community, and theenvironment. The scope of a PHA may range from a very simple screening analysisto a complex hazard and operability study (HAZOP).A HAZOP is a systematic, methodical examination of a process design that uses amulti-disciplinary team to identify hazards or operability problems that could resultin an accident. A HAZOP provides a prioritized basis for the implementation ofrisk mitigation strategies, such as SISs or ESDs.If a PHA determines that the mechanical integrity of a process and the processcontrol are insufficient to mitigate the potential hazard, an SIS is required. An SISconsists of the instrumentation or controls that are installed for the purpose ofmitigating a hazard or bringing a process to a safe state in the event of a processupset.A compliant program incorporates “good engineering practice.” This means thatthe program follows the codes and standards published by such organizations as theAmerican Society of Mechanical Engineers, American Petroleum Institute,American National Standards Institute, National Fire Protection Association,American Society for Testing and Materials, and National Board of Boiler andPressure Vessel Inspectors. Other countries have similar requirements.Chapter 1Safety Concepts
Page 1 and 2: TriconVersion 9Safety Consideration
Page 3: AcknowledgementTriconex acknowledge
Page 6 and 7: viRelated DocumentsRelated Document
Page 8 and 9: viiiHow to Contact TriconexHow to C
Page 10: xTrainingFor Turbomachinery Systems
Page 13 and 14: xiCONTENTSAbout This Guide ........
Page 15 and 16: xiiiAnalog Input Module Alarms ....
Page 17 and 18: CHAPTER 1Safety ConceptsThis chapte
Page 19: Safety Overview 3Protection LayersT
Page 23 and 24: Hazard and Risk Analysis 7Completio
Page 25 and 26: Hazard and Risk Analysis 9Equation
Page 27 and 28: Hazard and Risk Analysis 11Flowchar
Page 29 and 30: Hazard and Risk Analysis 13Some key
Page 31 and 32: Safety Standards 15Safety Standards
Page 33 and 34: Safety Standards 17Application-Spec
Page 35 and 36: CHAPTER 2Application GuidelinesThis
Page 37 and 38: General Guidelines 21• Under cert
Page 39 and 40: Guidelines for Tricon Controllers 2
Page 53 and 54: CHAPTER 3Fault ManagementThis chapt
Page 55 and 56: System Diagnostics 39System Diagnos
Page 57 and 58: Operating Modes 41Operating ModesEa
Page 59 and 60: Module Diagnostics 43Module Diagnos
Page 61 and 62: Module Diagnostics 45Relay Output M
Page 63 and 64: Module Diagnostics 47System Attribu
Page 65 and 66: CHAPTER 4Application DevelopmentThi
Page 67 and 68: Important TriStation Commands 51Imp
Page 69 and 70: Setting Scan Time 53Setting Scan Ti
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Sample Safety-Shutdown Programs 55S
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Sample Safety-Shutdown Programs 57I
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Sample Safety-Shutdown Programs 59A
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Sample Safety-Shutdown Programs 61P
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Sample Safety-Shutdown Programs 63O
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Sample Safety-Shutdown Programs 65D
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Sample Safety-Shutdown Programs 67P
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APPENDIX APeer-to-Peer Communicatio
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Data Transfer Time 71ParameterTS =S
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Examples of Peer-to-Peer Applicatio
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TR_CRITICAL_IO Function Block 75TR_
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TR_CRITICAL_IO Function Block 77Par
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TR_CRITICAL_IO Function Block 79Str
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TR_CRITICAL_IO Function Block 81CO
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TR_SHUTDOWN Function Block 83Parame
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TR_SHUTDOWN Function Block 85Relate
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TR_SHUTDOWN Function Block 87* Exam
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TR_SHUTDOWN Function Block 89TIMER_
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TR_VOTE_MODE Function Block 91Param
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TR_VOTE_MODE Function Block 93Appen
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APPENDIX BShutdown Function BlocksT
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TR_CRITICAL_IO Function Block 974 R
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TR_CRITICAL_IO Function Block 99Rel
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TR_CRITICAL_IO Function Block 101*
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TR_SHUTDOWN Function Block 103TR_SH
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TR_SHUTDOWN Function Block 105Param
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TR_SHUTDOWN Function Block 107Struc
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TR_SHUTDOWN Function Block 109IF CI
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TR_VOTE_MODE Function Block 111TR_V
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TR_VOTE_MODE Function Block 113Stru
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Index 115IndexAactual scan time 53a
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Index 117Modbus master functions 25
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Index 119timescan 53TMR architectur
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