Safety Considerations Guide for Triconex General ... - ICEWeb

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92 Appendix C Safety-Critical Function Blocks SYS_VOTE_MODE Converts redundancy status. Syntax MY_SYS_VOTE_MODE( CI:=b1, IN_TMR:=b2, GE_DUAL:=b3, GE_SINGLE:=b4 ) ; Input Parameters Name Data Type Description CI BOOL Enables SYS_VOTE_MODE. IN_TMR BOOL Three channels are operating. GE_DUAL BOOL Two or more channels are operating. GE_SINGLE BOOL One or more channels are operating. Output Parameters Name Data Type Description CO BOOL True if SYS_VOTE_MODE executes successfully. TMR BOOL Three channels are operating. DUAL BOOL Two channels are operating. SINGLE BOOL One or more channels are operating. ZERO BOOL No channel is operating. Description The SYS_VOTE_MODE function block converts redundancy status, as shown in this truth table. Truth Table TMR GE_DUAL GE_SINGLE TMR DUAL SINGL ZERO T T T T F F F F T T F T F F F F T F F T F F F F F F F T Other a F F F F a. If an error in the inputs occurs, then CO is false, the mode outputs are false, and the function block reports a bad parameter error (BADPARAM). Note GE_ means greater than or equal to. Safety Considerations Guide for Triconex General Purpose v2 Systems
SYS_VOTE_MODE 93 Example For shutdown examples, see this sample project: My Documents\Triconex\TriStation 1131 4.x\Projects\TdTUV.pt2 Runtime Errors Condition Return Value Error Flags If the inputs do not match one of the first four rows of the truth table Reset all BOOL outputs to false BADPARAM, ERROR Upon detection of a runtime error condition, the function block returns the indicated values and sets the error flags to true. For more information about error flags and runtime errors, see the TriStation 1131 Libraries Reference. Application Notes • Can be used in Safety or Control applications. • Space Saver: a single instance can be executed more than once per scan to reduce memory usage and increase performance. See the TriStation1131 Libraries Reference for more information. Library Trident and Tri-GP (TRDLIB) Structured Text FUNCTION_BLOCK SYS_VOTE_MODE VAR_INPUT CI : BOOL := TRUE ; (* Control in. *) IN_TMR : BOOL ; (* 3 channels operating. *) GE_DUAL : BOOL ; (* 2 or more channels operating. *) GE_SINGLE : BOOL ; (* 1 or more channels operating. *) END_VAR VAR_OUTPUT CO : BOOL ; (* Control out. *) TMR : BOOL ; (* Triple Modular Redundant. *) DUAL : BOOL ; (* Dual mode. *) SINGL : BOOL ; (* Single mode. *) ZERO : BOOL ; (* Zero mode. *) END_VAR VAR U : BOOL ; (* Unused Value. *) END_VAR (* *=F================================================================================ * FUNCTION_BLOCK: SYS_VOTE_MODE * Purpose: Convert redundancy status. * * Return: none * * Remarks: Safety Considerations Guide for Triconex General Purpose v2 Systems
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Triconex General Purpose v2 Systems
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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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Preface ix • All other requests a
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1 Safety Concepts Overview 2 Hazard
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Overview 3 Protection Layers Method
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Hazard and Risk Analysis 5 Hazard a
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Hazard and Risk Analysis 7 Sample S
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Hazard and Risk Analysis 9 Safety L
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Hazard and Risk Analysis 11 • Eac
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Safety Standards 13 CAN/CSA-C22.2 N
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2 Application Guidelines Overview 1
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General Guidelines 17 General Guide
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Guidelines for Triconex Controllers
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3 Fault Management Overview 32 Syst
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System Diagnostics 33 System Diagno
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Operating Modes 35 Operating Modes
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Module Diagnostics 37 Analog Output
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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: SYS_SHUTDOWN 91 ALARM_DISABLED_POIN
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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