1756-RM001B-EN-P, Using ControlLogix in SIL2 ... - Tuv-fs.com

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7-2 Faults in the ControlLogix SystemFigure 7.1GSVClass: CONTROLLERDEVICEAttribute: STATUSDestination: KEYSTATEKEYSTATE.13FaultFaultAlarm to OperatorIn this example, the Get System Value (GSV) instruction interrogatesthe STATUS attribute of the CONTROLLERDEVICE object and storesthe result in a word called KEYSTATE, where bits 12 and 13 define thestate of the keyswitch as shown in Table 7.1.Table 7.1Bit 13: Bit 12: Description:0 1 Keyswitch in Run position1 0 Keyswitch in Program position1 1 Keyswitch in Remote positionIf bit 13 is ever ON, then the keyswitch is not in the RUN position.Examining bit 13 of KEYSTATE for an ON state will generate a fault.For more information on the accessing the CONTROLLERDEVICEobject, see the Logix5000 Controllers General Instructions ReferenceManual, publication 1756-RM003.Publication 1756-RM001B-EN-P - October 2003
Faults in the ControlLogix System 7-3Examining an Analog InputModule’s High AlarmControlLogix analog modules perform processing and comparison offield data values right on the module, allowing for easy examinationof status bits to initiate a fault.For example, the 1756-IF8 module can be configured withuser-defined alarm values that, when exceeded, will set a status bit onthe module which is then sent back to the controller. The user maythen examine the state of these bits to initiate a fault as shown inFigure 7.2:Figure 7.2Ch1HAlarmFaultFaultAlarm to OperatorIn the example above, the High Alarm bit for channel 1 (CH1HAlarm)is being examined for an On condition to initiate a fault. Duringoperation, as the analog input module processes analog signals fromthe field sensors, if the value for channel 1 exceeds the user-definedvalue configured for Channel 1’s High Alarm, the (CH1HAlarm) bit isset and sent to the controller and a fault is declared.Publication 1756-RM001B-EN-P - October 2003
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Using ControlLogixin SIL2 Applicati
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Summary of Changes 2Notes:Publicati
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Preface 2Table Preface.1Section: Ti
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Table of Contents 2ControlLogix Com
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Table of Contents 4Additional Infor
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1-2 SIL PolicyThe TUV Rheinland has
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1-4 SIL PolicySIL2 CertificationFig
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1-6 SIL PolicySIL2-Certified Contro
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1-8 SIL PolicyHardware Designs andF
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1-10 SIL PolicyCatalogNumberDescrip
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1-12 SIL PolicyCatalogNumberDescrip
Page 24 and 25: 1-14 SIL PolicySIL ComplianceDistri
Page 26 and 27: 1-16 SIL PolicyProgram Watchdog Tim
Page 28 and 29: 2-2 The ControlLogix SystemIf an an
Page 30 and 31: 2-4 The ControlLogix SystemData Ech
Page 32 and 33: 2-6 The ControlLogix SystemSoftware
Page 34 and 35: 2-8 The ControlLogix SystemNotes:Pu
Page 36 and 37: 3-2 ControlLogix System HardwareCon
Page 38 and 39: 3-4 ControlLogix System HardwareRec
Page 40 and 41: 3-6 ControlLogix System HardwareNot
Page 42 and 43: 4-2 ControlLogix ControllerRecommen
Page 44 and 45: 5-2 ControlLogix Communications Mod
Page 46 and 47: 5-4 ControlLogix Communications Mod
Page 48 and 49: 6-2 ControlLogix I/O ModulesFigure
Page 50 and 51: 6-4 ControlLogix I/O ModulesModule
Page 52 and 53: 6-6 ControlLogix I/O ModulesWiring
Page 54 and 55: 6-8 ControlLogix I/O ModulesGeneral
Page 58 and 59: 6-12 ControlLogix I/O ModulesApplic
Page 60 and 61: 6-14 ControlLogix I/O Modules• Ch
Page 66 and 67: 6-20 ControlLogix I/O ModulesUsing
Page 68 and 69: 6-22 ControlLogix I/O ModulesFigure
Page 72 and 73: 6-26 ControlLogix I/O ModulesCheckl
Page 76 and 77: 7-4 Faults in the ControlLogix Syst
Page 78 and 79: 8-2 General Requirements for Applic
Page 84 and 85: 9-2 Technical SIL2 Requirements for
Page 92 and 93: 10-2 Use and Application of Human t
Page 94 and 95: 10-4 Use and Application of Human t
Page 96 and 97: A-2 Response Times in ControlLogixE
Page 98 and 99: A-4 Response Times in ControlLogixR
Page 100 and 101: B-2 System Self-Testing and User-Pr
Page 102 and 103: C-2 Additional Information on Handl
Page 104 and 105: D-2 Spurious Failure EstimatesNotes
Page 106 and 107: E-2 Sample Probability of Failure o
Page 108 and 109: E-4 Sample Probability of Failure o
Page 110: 2 IndexMMean time between failures
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1756-RM001B-EN-P, Using ControlLogix in SIL2 ... - Tuv-fs.com

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