IC693ACC302

为了防止意外和查看问题方便，我们将备用的存贮器换上，因其RAM中无用户程序。此时，能引发CPU等待的错误主要有两个方面：特殊I/O单元等待及扩展I/O单元等待。首先，我们查看了扩展单元的各部分，其电源供给正常，发现连接电缆插头松动，插好，试机，PL***U依然停机，但无存贮器错误显示。由于系统未进行I/O地址登记，为查找原因方便，将扩展机架“离线”操作，直接检查主板特殊单元。存贮器中RAM为空白，只要拆下坏的模板后，CPU就应运行，其RUN指示灯亮（编程器置RUN或MONIT状态）。当拆下主板上OD215模板后，RUN亮，将备用的OD215进行状态设置，替换后也亮。此时，再将原来的存贮器换上，结果编程器上蜂鸣器马上声响，又出现MEMORYERR出错信息，可见存贮器也被烧坏。只能用备用的存贮器，重新输入原始用户程序，分段检查、试车，***后全部重新试车，系统正常，交付使用。

 

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