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

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6-26 ControlLogix I/O ModulesChecklist for SIL OutputsThe following checklist is required for planning, programming andstart up of SIL outputs. It may be used as a planning guide as well asduring proof testing. If used as a planning guide, the checklist can besaved as a record of the plan.For programming or start-up, an individual requirement checklist mustbe filled in for every single SIL output channel in a system. This is theonly way to make sure that the requirements are fully and clearlyimplemented. This checklist can also be used as documentation onthe connection of external wiring to the application program.Output Check List for ControlLogix SystemCompany:Site:Loop definition:SIL output channels in the:No. All Output Module Requirements (apply to both digital and analog output modules) Yes No Comment:1 Have you performed proof tests on the modules?2 Is Exact Match selected as the electronic keying option for all modules?3 Is the RPI value set to an appropriate value for your application?4 Have you set up fault routines, including comparing output data with a corresponding input point?5 If required, have you used external relays in your application to disconnect module power if ashort or other fault is detected on the module or isolated output in series?6 Is the control of the external relay implemented in ladder logic?7 Have you examined the Output Data Echo signal in application logic?8 Are all outputs configured to deenergize in the event of a fault or the controller entering program mode?9 Do two modules of the same type, used in the same application, use identical configurations?10 Does one controller own both modules if two of the same type are used in an application?11 Are control, diagnostics and alarming functions performed in sequence in application logic?No. Digital Output Module-Only Requirements Yes No Comment1 For the standard output modules, is the Communication Format set to Output Data?2 For standard output modules, have you wired the outputs to a corresponding input to validatethat the output is following its commanded state?3 For the diagnostic output modules, are all diagnostics enabled on the module?4 For the diagnostic output modules, are enabled diagnostic bits monitored by fault routines?5 For the diagnostic output modules, is the Communication Format set to FullDiagnostics-Output Data?6 For diagnostic output modules, have you periodically performed a Pulse Test to make surethat the output is capable of change state?7 For diagnostic output modules, is the connection to remote modules a direct connection?No. Analog Output Module-Only Requirements Yes No Comment1 Is the Communication Format set to Float Data?2 Have you calibrated the modules as often as required by your application?3 When wiring the 1756-OF8 in current mode, are loop devices placed properly?4 Have you written application logic to examine bits for any condition that may cause a faultand appropriate fault routines to handle the fault condition?Publication 1756-RM001B-EN-P - October 2003
Chapter 7Faults in the ControlLogix SystemIntroductionThe ControlLogix architecture provides the user many ways ofdetecting and reacting to faults in the system. The first way that userscan handle faults is to make sure they have completed the input andoutput checklists listed on pages 6-25 and 6-26 for their application.In addition to the checklists mentioned above, various device objectscan be interrogated to determine the current operating status.Additionally, modules provide run-time status of their operation andof the process. It is up to users to determine what data is mostappropriate for their application to initiate a shutdown sequence.This chapter explains two example conditions that will generate afault in a SIL2-certified ControlLogix system:• Keyswitch changing out of RUN mode• High alarm condition on an analog input moduleFor more information on the analog status bits available forexamination, see the ControlLogix Analog I/O Modules User Manual,publication 1756-UM009.For information on System Self-Testing andUser-Programmed Responses, see Appendix B.For more information on faults, see Appendix C, AdditionalInformation on Handling Faults in the ControlLogix System.Checking KeyswitchPosition with GSVInstructionThe following rungs generate a fault if the keyswitch on the front ofthe controller is switched from the Run mode:1 Publication 1756-RM001B-EN-P - October 2003
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Using ControlLogixin SIL2 Applicati
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Page 104 and 105: D-2 Spurious Failure EstimatesNotes
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