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

6-10 ControlLogix I/O ModulesWiring ControlLogix DigitalOutput ModulesDiagnostic Digital Output ModulesDiagnostic output modules have advanced circuitry that is notincluded in standard output modules. Because of the advanceddesign, users are not required to use an input module to monitoroutput status, as is required with standard output modules.Diagnostic Output modules can be used as-is in a SIL2 application (inother words, no special wiring considerations need be employedother than the wiring of the external relay to remove line power fromthe module in the event of a fault to make sure outputs willde-energize if shorted).In addition to following the General Considerations when using AnyControlLogix Digital Output Module on page 6-8, the user mustperform a Pulse Test on each output periodically to make sure that theoutput is capable of changing state. Automatic diagnostic testing ofoutput modules should be made at intervals that are an order ofmagnitude less than the demand rate. For example, pulse testingshould be scheduled at least once a month for a low demandsystem and at least once hour for a high demand system.For more information on performing the pulse test, see theControlLogix Digital I/O Modules User Manual, publication1756-UM058.Users should also make sure they always use a direct connection withdiagnostic output modules located in remote chassis.Figure 6.7 ControlLogix Diagnostic Output Module WiringV-/L2V+/L2V+/L1This relay is controlled bythe rest of the ControlLogixsystem. If a short circuit orfault occurs on the module,the relay can disconnectpower to the module.OutputActuatorAlso, this relay can be wiredto disconnect power tomultiple modules.43365Publication 1756-RM001B-EN-P - October 2003