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

ControlLogix I/O Modules 6-11Standard Digital Output ModulesWhen using standard (also known as non-diagnostic) output modules,users must wire an output to an actuator and then back to an input tomonitor the output’s performance. The user can write the appropriatelogic to test the output’s ability to turn ON and OFF at power-up, or,at the proof test interval (see page 1-5), the user can force the outputON and OFF and use a voltmeter to verify output performance.Automatic testing of output modules (i.e. the user turns the outputsON and OFF to verify proper operation) should be made at intervalsthat are an order of magnitude less than the demand rate. Forexample, output testing should be scheduled at least once a monthfor a low demand system and at least once an hour for a highdemand system.In addition to following the General Considerations when using AnyControlLogix Digital Output Module on page 6-8, the user must wireeach standard output to a corresponding input to validate that theoutput is following its commanded state.Figure 6.8 ControlLogix Standard Output Module WiringStandard IsolatedOutput ModuleStandard IsolatedInput ModuleV-/L2V+/L1V+/L1Wire output pointto input point toverify the correctstate of the outputInputThis relay is controlled by anotheroutput in the ControlLogix system. If ashort circuit or fault occurs on outputmodules, the relay can disconnectpower to the modules.OutputActuatorV-/L2Also, this relay can be wired todisconnect power to multiple modules.43363Publication 1756-RM001B-EN-P - October 2003