窗式WDT和容错技术在工控微机系统中的应用

The Application of Window Type WDT and Fault Tolerance to Industry Control Microcomputer System

介绍一种具有带通特性的定时监视器，当微机发出的触发脉冲间隔过长或太短时它就会发出更让或中断信号。还讨论了程序模块划分和查错方法，除了对运行时间核查之外，每个模块还对结果的合理性进行检查，并且通过在模块的人口设立标志以及在出口进行对比来检查模块跨界运行的错误。

A watchdog timer (WDT) with bandpass proper-ty is introduced, which issues reset or interrupt signals if theWDT puses generated by the microcomputer have a periodeither too long or too short. The program module pertition-ing and some verification mechanisms are also discussed.Besides execution time checking. each module has self-checking for the reasonableness of results. the flow errorsof module boundaries crasing. which is realized by assign-ing a flag at the entry point and matching the flag at theexit point of the module.