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

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2 Safety OverviewSafety OverviewModern industrial processes tend to be technically complex, involve substantialenergies, and have the potential to inflict serious harm to persons or propertyduring a mishap.The IEC 61508 standard defines safety as “freedom from unacceptable risk.” Inother words, absolute safety can never be achieved; risk can only be reduced to anacceptable level.Safety methods to mitigate harm and reduce risk include:• Changing the process or mechanical design, including plant or equipmentlayout• Increasing the mechanical integrity of equipment• Improving the basic process control system (BPCS)• Developing additional or more detailed training procedures for operationsand maintenance• Increasing the testing frequency of critical components• Using a safety-instrumented system (SIS)• Installing mitigating equipment to reduce harmful consequences; forexample, explosion walls, foams, impoundments, and pressure reliefsystemsMethods that provide layers of protection should be:• Independent• Verifiable• Dependable• Designed for the specific safety riskTricon Safety Considerations Guide
Safety Overview 3Protection LayersThe figure below shows how layers of protection can be used to reduceunacceptable risk to an acceptable level. The amount of risk reduction for eachlayer is dependent on the specific nature of the safety risk and the impact of thelayer on the risk. Economic analysis should be used to determine the appropriatecombination of layers for mitigating safety risks.Acceptable Risk LevelMechanical IntegrityInherent Process RiskSVSISBPCS*Effect of ProtectionLayers on ProcessRisk0Lower RiskProcessHigher Risk* BPCS–Basic process control systemSIS–Safety-instrumented systemSV–Safety (relief) valveWhen an SIS is required, one of the following should be determined:• Level of risk reduction assigned to the SIS• Safety integrity level (SIL) of the SISTypically, a determination is made according to the requirements of the ANSI/ISAS84.01 or IEC 61508 standards during a process hazard analysis (PHA). A processdemand is defined as the occurrence of a process deviation that causes an SIS totransition a process to a safe state.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: CHAPTER 1Safety ConceptsThis chapte
Page 21 and 22: Hazard and Risk Analysis 5Hazard an
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
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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
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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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