Safety Considerations Guide for Trident v2 Systems - TUV ...

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12 Chapter 1 Safety Concepts Safety Standards Over the past several years, there has been rapid movement in many countries to develop standards and regulations to minimize the impact of industrial accidents on citizens. The standards described in this section apply to typical applications. General Safety Standards IEC 61508, Parts 1–7 The IEC 61508 standard, “Functional Safety: Safety Related Systems,” is an international standard designed to address a complete SIS for the process, transit, and medical industries. The standard introduces the concept of a safety life cycle model (see Figure 5 on page 9) to illustrate that the integrity of an SIS is not limited to device integrity, but is also a function of design, operation, testing, and maintenance. The standard includes four SILs that are indexed to a specific probability-to-fail-on-demand (PFD) (see Figure 2 on page 5). A SIL assignment is based on the required risk reduction as determined by a PHA. ANSI/ISA S84.01 ANSI/ISA S84.01-1996 is the United States standard for safety systems in the process industry. The SIL classes from IEC 61508 are used and the DIN V 19250 relationships are maintained. ANSI/ISA S84.01-1996 does not include the highest SIL class, SIL 4. The S84 Committee determined that SIL 4 is applicable for medical and transit systems in which the only layer of protection is the safety-instrumented layer. In contrast, the process industry can integrate many layers of protection in the process design. The overall risk reduction from these layers of protection is equal to or greater than that of other industries. IEC 61511, Parts 1–3 The IEC 61511 standard, “Functional Safety: Safety Instrumented Systems for the Process Industry Sector,” is an international standard designed to be used as a companion to IEC 61508. IEC 61511 is intended for SIS designers, integrators, and users in the process-control industry. Application-Specific Standards NFPA 85 NFPA 85, “Boiler and Combustion Systems Hazards Code,” outlines the United States requirements for operations using single burner boilers and multiple burner boilers. Safety Considerations Guide for Trident v2 Systems
CAN/CSA-C22.2 No. 61010-1-04 Safety Standards 13 CAN/CSA-C22.2 No. 61010-1-04, “Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use, Part 1: General Requirements,” outlines the Canadian requirements for burner management applications. Safety Considerations Guide for Trident v2 Systems
Page 1 and 2: Trident v2 Systems Safety Considera
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: • All other requests are handled
Page 11 and 12: 1 Safety Concepts Overview 2 Hazard
Page 13 and 14: Protection Layers Methods that prov
Page 15 and 16: Hazard and Risk Analysis Hazard and
Page 17 and 18: Sample SIL Calculation Hazard and R
Page 19 and 20: Safety Life Cycle Model Hazard and
Page 21: Hazard and Risk Analysis 11 • Eac
Page 25 and 26: 2 Application Guidelines Overview 1
Page 27 and 28: General Guidelines This section des
Page 29 and 30: General Guidelines 19 Safety Measur
Page 31 and 32: Emergency Shutdown Systems The safe
Page 33 and 34: Safety-Shutdown Guidelines for Tric
Page 35 and 36: Guidelines for Triconex Controllers
Page 43 and 44: 3 Fault Management Overview 34 Syst
Page 45 and 46: System Diagnostics System Diagnosti
Page 47 and 48: Operating Modes Each input or outpu
Page 49 and 50: Analog Output (AO) Modules Module D
Page 51 and 52: Calculation for Diagnostic Fault Re
Page 53 and 54: External Communication Module Diagn
Page 55 and 56: 4 Application Development Developme
Page 57 and 58: Array Index Errors Infinite Loops D
Page 59 and 60: Setting Scan Time 49 application. T
Page 61 and 62: Sample Safety-Shutdown Programs Sam
Page 63 and 64: Sample Safety-Shutdown Programs 53
Page 65 and 66: When Some I/O Modules Are Safety-Cr
Page 67 and 68: Sample Safety-Shutdown Programs 57
Page 69 and 70: Partitioned Processes Sample Safety
Page 71 and 72: Alarm Usage Alarm Usage 61 To imple
Page 73 and 74:
A Triconex Peer-to-Peer Communicati
Page 75 and 76:
Data Transfer Time Data Transfer Ti
Page 77 and 78:
Data Transfer Time 67 A typical dat
Page 79 and 80:
Examples of Peer-to-Peer Applicatio
Page 81 and 82:
B HART Communication Overview 72 HA
Page 83 and 84:
2008-04-01 Automation, Software and
Page 85 and 86:
2008-04-01 HART Position Paper from
Page 87 and 88:
2008-04-01 A possible impact to the
Page 89 and 90:
2008-04-01 HART Position Paper from
Page 91 and 92:
C Safety-Critical Function Blocks O
Page 93 and 94:
SYS_CRITICAL_IO Accumulates the sta
Page 95 and 96:
Library Trident and Tri-GP (TRDLIB)
Page 97 and 98:
END_IF ; PREVIOUS_RESET := RESET ;
Page 99 and 100:
Output Parameters (continued) Name
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SYS_SHUTDOWN 91 * the safety system
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ALARM_DISABLED_POINTS := MPX.POINTS
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Example For shutdown examples, see
Page 107 and 108:
A abbreviations, list of viii actua
Page 109 and 110:
message errors, external communicat
Page 112:
Invensys Operations Management 5601
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