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

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

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

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9-4 Technical <strong>SIL2</strong> Requirements for the Application ProgramActuators• Position and activation <strong>in</strong> standard operation (normally OFF)• Safe reaction/position<strong>in</strong>g when switch<strong>in</strong>g OFF, power failurerespectively.• Discrepancy monitor<strong>in</strong>g and visualization, <strong>in</strong>clud<strong>in</strong>g the user’sdiagnostic logicSIL Task/ProgramInstructionsThe user program may conta<strong>in</strong> a s<strong>in</strong>gle SIL task <strong>com</strong>posed of multipleprograms and rout<strong>in</strong>es. This is a timed task with a user-selectable taskpriority and watchdog. The <strong>SIL2</strong> task must be the controller’s toppriority and the user-def<strong>in</strong>ed program watchdog (software watchdog)must be set to ac<strong>com</strong>modate the <strong>SIL2</strong> task and any other tasks. Formore <strong>in</strong>formation, see Chapter 1, SIL Policy.Safety logic and non safety-related programs must be separate.Programm<strong>in</strong>g LanguagesAll programm<strong>in</strong>g languages (for example, ladder logic, functionblock) available <strong>in</strong> the <strong>ControlLogix</strong> system will also be available forprogramm<strong>in</strong>g the <strong>ControlLogix</strong> controller for <strong>SIL2</strong> applications.Publication <strong>1756</strong>-<strong>RM001B</strong>-<strong>EN</strong>-P - October 2003

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