窗式WDT和容错技术在工控微机系统中的应用

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

本文介绍了一种具有带通特性的定时监视器，当微机发出的脉冲间隔过长或太短时它就会发出复位或中断信号。本文还讨论了程序块划分和查错方法，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，并通过在模块的入口设立标志以及在出口进行比对来检查模块跨界运行的错误。

This paper introduces a watchdog timer withbandpass behavior,which issues reset or interrupt signals if the WDT pulses generated by the microcomputer have a period either too long or too short. It alsodiscusses program module partitioning and some verification mechanisms, besides execution time checking,each module has self--checking for the reasonablenessof results, the flow errors of module boundaries crossing, which is realized by assigning a flag at the entrypoint and matching the flag at the exit point of themodule.