安全系統(tǒng)軟件設(shè)計(jì)swdesig-資料下載頁(yè)
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【正文】 d ponent Component Type Test Verified ponent Product Type Test Validated Prod. BCRAT 169。 ABB Page 14 Vmodel ? Summary of the Vmodel ? Left branches represent specification, design and coding ? Right branches represent test and verification phases ? Feedback between phases s required ? Design and test are linked via verification activities 169。 ABB Page 15 Measures to Control Failures ? Examples ? Hardware architecture ? Self Test measures for systems and subsystem ? CPU ? Bus and Signals ? RAM, EEPROM, ROM, flash ? System watchdog with independent time base ? Program flow monitoring ? Safety protocols for data transmission paths ? Redundant and/or inverse data storage 169。 ABB Page 16 Summary ? In this module ? Safety software is more about the process of softwre development than the software itself ? Systematic approach via Vmodel ? Measure to control and avoid failueres need to be applied 169。 ABB Page 17 Company Confidential
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