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

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92 Appendix C Safety-Critical Function Blocks MAX_TIME_SINGLE < T#0S OR MAX_SCAN_TIME < T#0S THEN ERROR := 1 ; ELSIF IO_ERROR 0 THEN ERROR := 2 ; ELSIF NOT SYSTEM.CO OR NOT MP.CO OR NOT MPX.CO THEN ERROR := 3 ; END_IF ; CO := ERROR = 0 ; IF CO THEN (* Summarize redundancy. *) TMR := NOT IO_CO AND SYSTEM.TMR AND SYSTEM.IO_NO_VOTER_FLTS OR IO_CO AND MP.TMR AND IO_TMR ; GE_DUAL := NOT IO_CO AND SYSTEM.GE_DUAL AND SYSTEM.IO_NO_VOTER_FLTS OR IO_CO AND MP.GE_DUAL AND IO_GE_DUAL ; GE_SINGLE := NOT IO_CO AND SYSTEM.GE_SINGLE OR IO_CO AND IO_GE_SINGLE ; (* Update timers. *) DUAL_TIME( IN := NOT TMR, PT := MAX_TIME_DUAL ) ; SINGLE_TIME( IN := NOT GE_DUAL, PT := MAX_TIME_SINGLE ) ; (* Shutdown if excessive time in degraded operation. *) OPERATING := GE_SINGLE AND NOT DUAL_TIME.Q AND NOT SINGLE_TIME.Q ; (* Output current status. *) DUAL := GE_DUAL AND NOT TMR ; SINGL := GE_SINGLE AND NOT GE_DUAL ; ZERO := NOT GE_SINGLE ; TIMER_RUNNING := OPERATING AND NOT TMR ; (* Output time remaining to shutdown. *) IF NOT OPERATING THEN TIME_LEFT := T#0s ; ELSIF TMR THEN TIME_LEFT := T#999999d ; ELSIF GE_DUAL OR MAX_TIME_DUAL-DUAL_TIME.ET MAX_SCAN_TIME ; Safety Considerations Guide for Trident v2 Systems
ALARM_DISABLED_POINTS := MPX.POINTS_DISABLED > 0 ; SYS_SHUTDOWN 93 ELSE (* Programming error. *) U := ReportBadParam(0) ; OPERATING := FALSE ; TMR := FALSE ; GE_DUAL := FALSE ; GE_SINGLE := FALSE ; DUAL := FALSE ; SINGL := FALSE ; ZERO := FALSE ; TIMER_RUNNING := FALSE ; TIME_LEFT := T#0S; ALARM_PROGRAMMING_PERMITTED := TRUE ; ALARM_REMOTE_ACCESS := TRUE ; ALARM_RESPONSE_TIME := TRUE ; ALARM_DISABLED_POINTS := TRUE ; END_IF ; END_IF ; END_FUNCTION_BLOCK Safety Considerations Guide for Trident v2 Systems
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Trident v2 Systems Safety Considera
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Contents Preface vii Summary of Sec
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Contents v Partitioned Processes. .
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Preface This guide provides informa
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• All other requests are handled
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1 Safety Concepts Overview 2 Hazard
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Protection Layers Methods that prov
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Hazard and Risk Analysis Hazard and
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Sample SIL Calculation Hazard and R
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Safety Life Cycle Model Hazard and
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Hazard and Risk Analysis 11 • Eac
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CAN/CSA-C22.2 No. 61010-1-04 Safety
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2 Application Guidelines Overview 1
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General Guidelines This section des
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General Guidelines 19 Safety Measur
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Emergency Shutdown Systems The safe
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Safety-Shutdown Guidelines for Tric
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Guidelines for Triconex Controllers
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3 Fault Management Overview 34 Syst
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System Diagnostics System Diagnosti
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Operating Modes Each input or outpu
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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
Page 101: SYS_SHUTDOWN 91 * the safety system
Page 105 and 106: 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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