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

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82 Appendix C Safety-Critical Function Blocks Overview This appendix describes the function blocks intended for use in safety-critical applications and shows the Structured Text code for the following function blocks: • SYS_CRITICAL_IO on page 83 • SYS_SHUTDOWN on page 88 • SYS_VOTE_MODE on page 94 Safety Considerations Guide for Trident v2 Systems
SYS_CRITICAL_IO Accumulates the status of safety-critical I/O modules. Syntax MY_SYS_CRITICAL_IO( CI:=b1, RESET:=b2, IOP:=n1, SLOT:=n2, APP:=n3, RELAY_OK:=b3 ) ; Input Parameters Name Data Type Description CI BOOL Enables SYS_CRITICAL_IO. RESET BOOL Resets. IOP DINT The IOP (0–15). SLOT DINT The slot number (0–56). APP DINT The application number (1-2). RELAY_OK BOOL The relay is energized and not stuck. Output Parameters Name Data Type Description CO BOOL True if SYS_CRITICAL_IO executes successfully. TMR BOOL Three channels are operating without faults on all critical I/O module. GE_DUAL BOOL At least two channels are operating without faults on all critical I/O module. GE_SINGLE BOOL At least one channel is operating without faults on all critical I/O module. NO_VOTER_FLTS BOOL No voter faults detected on critical modules. ERROR_NUM DINT Error Number: 0 = No error. –1 = The IOP is invalid. –2 = The slot is not valid. –3 = The module is not configured. –4 = The module is the wrong type. Description SYS_CRITICAL_IO 83 The SYS_CRITICAL_IO function block accumulates the status of safety-critical I/O modules. 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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Page 41 and 42: 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: C Safety-Critical Function Blocks O
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 and 102: SYS_SHUTDOWN 91 * the safety system
Page 103 and 104: ALARM_DISABLED_POINTS := MPX.POINTS
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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