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

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2-4 The ControlLogix SystemData Echo Communication CheckAnother powerful by-product of the p/c communication model andthe implementation of the Control and Information Protocol (CIP)protocol is the Output Data Echo, a communication methodemployed between owner-controllers and every output module in thesystem. Output Data Echo allows the user to verify that an ON/OFFoutput command from the controller was actually received by thecorrect output module, and that the module will attempt to executethe command to the field device connected to it.During normal operation, when a controller sends an outputcommand, the output module that is targeted for that command will“echo” that requested state back to the system upon its receipt. Thisverifies that the module has received the command and will try toexecute it. By comparing the requested state from the controller to theData Echo received from the module, the user can validate that thesignal has reached the correct module and that the module willattempt to activate the appropriate field-side device. Again, it is theuser’s responsibility to establish the course of action appropriate totheir safety application.When used with standard ControlLogix output modules, the DataEcho validates the command up to the system-side of the module, butnot to the field-side. However, when this feature is used in tandemwith diagnostic output modules, the user can virtually verify theoutput command integrity from the controller to the actuatorconnected to the module.Diagnostic output modules contain special circuitry that performsField Side Output Verification. Field Side Output Verificationinforms the user that system-side commands received by the moduleare accurately represented on the power side of the switching device.In other words, for each output point, this feature confirms that theoutput is ON when it is commanded to be ON or OFF whencommanded to be OFF.The capability of comparing the actual state of the field-side of thediagnostic module’s output against what the controller commandsgives the user the ability to make sure that the module is performingwhat the control system is requesting, once that output command hasbeen issued.Publication 1756-RM001B-EN-P - October 2003
The ControlLogix System 2-5Figure 2.2 Output Module Behavior in the ControlLogix SystemOutput Commands from ControllerStandardControlLogix I/OInformationData Echo validation from system-sideAdditional Field-SideInformation provided byDiagnostic Output modulesField-side Output Verification, PulseTest status plus No Load detectionActuatorPulse TestA diagnostic output module feature called a Pulse Test can verifyoutput circuit functionality without actually changing the state of theactuator connected to the output. Under user program control, anextremely short-duration pulse is directed to a particular output on themodule. The output circuitry will momentarily change its current statelong enough to verify that it CAN change state when requested, butshort enough in duration (the actual pulse is measured inmilliseconds) not to effect the actuator connected to the output. Thispowerful feature allows a user to perform a preemptive diagnosis ofpossible future module conditions before they occur.Publication 1756-RM001B-EN-P - October 2003
Page 1: Using ControlLogixin SIL2 Applicati
Page 4 and 5: Summary of Changes 2Notes:Publicati
Page 6 and 7: Preface 2Table Preface.1Section: Ti
Page 8 and 9: Table of Contents 2ControlLogix Com
Page 10 and 11: Table of Contents 4Additional Infor
Page 12 and 13: 1-2 SIL PolicyThe TUV Rheinland has
Page 14 and 15: 1-4 SIL PolicySIL2 CertificationFig
Page 16 and 17: 1-6 SIL PolicySIL2-Certified Contro
Page 18 and 19: 1-8 SIL PolicyHardware Designs andF
Page 20 and 21: 1-10 SIL PolicyCatalogNumberDescrip
Page 22 and 23: 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 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 74 and 75: 7-2 Faults in the ControlLogix Syst
Page 76 and 77: 7-4 Faults in the ControlLogix Syst
Page 78 and 79: 8-2 General Requirements for Applic
Page 80 and 81:
8-4 General Requirements for Applic
Page 82 and 83:
8-6 General Requirements for Applic
Page 84 and 85:
9-2 Technical SIL2 Requirements for
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Page 88 and 89:
Page 90 and 91:
Page 92 and 93:
10-2 Use and Application of Human t
Page 94 and 95:
10-4 Use and Application of Human t
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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
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C-2 Additional Information on Handl
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D-2 Spurious Failure EstimatesNotes
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E-2 Sample Probability of Failure o
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E-4 Sample Probability of Failure o
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2 IndexMMean time between failures
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1756-RM001B-EN-P, Using ControlLogix in SIL2 ... - Tuv-fs.com

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