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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9-2 Technical <strong>SIL2</strong> Requirements for the Application ProgramBasics of Programm<strong>in</strong>gThe control program must be available as a specification or aperformance specification. This documentation forms the basis for thecheck of correct transformation <strong>in</strong>to the program. The type ofpresentation of the specification depends on the task to be carriedout. This can be:Logic and InstructionsThe logic and <strong>in</strong>structions used <strong>in</strong> programm<strong>in</strong>g the application mustbe:• easy to understand• easy to trace• easy to change• easy to testProgram LogicUser must implement simple, easy to understand:• ladder• other IEC 1131-<strong>com</strong>pliant languageor• function blocks with specified characteristics.We use ladder, for example, because, it is easier to visualize and makepartial program changes with this format.Publication <strong>1756</strong>-<strong>RM001B</strong>-<strong>EN</strong>-P - October 2003
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