Safety Considerations Guide for Triconex General ... - ICEWeb

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32 Chapter 3 Fault Management Overview The Tri-GP controller has been designed from its inception with self-diagnostics as a primary feature. Triple-Modular Redundant (TMR) architecture (shown in Figure 9) ensures fault tolerance and provides error-free, uninterrupted control in the event of hard failures of components or transient faults from internal or external sources. Each I/O module houses the circuitry for three independent channels. Each channel on the input modules reads the process data and passes that information to its respective main processor. The three Main Processor (MP) modules communicate with each other using a proprietary, high-speed bus system called the TriBus. Extensive diagnostics on each channel, module, and functional circuit quickly detect and report operational faults by means of indicators or alarms. This fault information is available to an application. It is critical that an application properly manage fault information to avoid an unnecessary shutdown of a process or plant. This section discusses the methods for properly handling faults. Input Module Hot Spare Output Module Hot Spare Input Channel A Channel A I/O Bus Output Channel A MP A (SX) IOP A (IOX) Field Input Input Channel B Channel B IO/ Bus MP B IOP B (SX) (IOX) TriBus & TriTime Diagnostic Channel Output Channel B Output Voter Field Output Input Channel C Channel C I/O Bus Output Channel C MP C (SX) IOP C (IOX) Figure 9 Typical Triconex Controller Safety Considerations Guide for Triconex General Purpose v2 Systems
System Diagnostics 33 System Diagnostics To improve system availability and safety, a safety system must be able to detect failures and provide the means for managing failures properly. The controller’s diagnostics may be categorized as: • Reference diagnostics: Comparing an operating value to a predetermined reference, such as a system specification. • Comparison diagnostics: Comparing one component to another, such as one independent channel with two other independent channels. • Field device diagnostics: Diagnostics are extended to a system’s field devices and wiring. Safety Considerations Guide for Triconex General Purpose v2 Systems
Page 1 and 2: Triconex General Purpose v2 Systems
Page 3 and 4: Contents Preface vii Summary of Sec
Page 5 and 6: Contents v Partitioned Processes. .
Page 7 and 8: Preface This guide provides informa
Page 9 and 10: Preface ix • All other requests a
Page 11 and 12: 1 Safety Concepts Overview 2 Hazard
Page 13 and 14: Overview 3 Protection Layers Method
Page 15 and 16: Hazard and Risk Analysis 5 Hazard a
Page 17 and 18: Hazard and Risk Analysis 7 Sample S
Page 19 and 20: Hazard and Risk Analysis 9 Safety L
Page 21 and 22: Hazard and Risk Analysis 11 • Eac
Page 23 and 24: Safety Standards 13 CAN/CSA-C22.2 N
Page 25 and 26: 2 Application Guidelines Overview 1
Page 27 and 28: General Guidelines 17 General Guide
Page 29 and 30: Guidelines for Triconex Controllers
Page 41: 3 Fault Management Overview 32 Syst
Page 45 and 46: Operating Modes 35 Operating Modes
Page 47 and 48: Module Diagnostics 37 Analog Output
Page 49 and 50: Module Diagnostics 39 Calculation f
Page 51 and 52: Module Diagnostics 41 External Comm
Page 53 and 54: 4 Application Development Developme
Page 55 and 56: Development Guidelines 45 Array Ind
Page 57 and 58: Setting Scan Time 47 application. T
Page 59 and 60: Sample Safety-Shutdown Programs 49
Page 69 and 70: Alarm Usage 59 Alarm Usage To imple
Page 71 and 72: A Triconex Peer-to-Peer Communicati
Page 73 and 74: Data Transfer Time 63 Data Transfer
Page 75 and 76: Data Transfer Time 65 A typical dat
Page 77 and 78: Examples of Peer-to-Peer Applicatio
Page 79 and 80: B HART Communication Overview 70 HA
Page 81 and 82: HART Position Paper from TÜV Rhein
Page 89 and 90: C Safety-Critical Function Blocks O
Page 91 and 92: SYS_CRITICAL_IO 81 SYS_CRITICAL_IO
Page 93 and 94:
SYS_CRITICAL_IO 83 Library Trident
Page 95 and 96:
SYS_CRITICAL_IO 85 END_IF ; PREVIOU
Page 97 and 98:
SYS_SHUTDOWN 87 Output Parameters (
Page 99 and 100:
SYS_SHUTDOWN 89 * the safety system
Page 101 and 102:
SYS_SHUTDOWN 91 ALARM_DISABLED_POIN
Page 103 and 104:
SYS_VOTE_MODE 93 Example For shutdo
Page 105 and 106:
Index A abbreviations, list of viii
Page 107 and 108:
Index 97 N NFPA 85 12 O operating m
Page 110:
Invensys Operations Management 5601
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