GE IC695CPU320-HS

定时中断性能

激活一个空的程序块的I/0中断的扫描影响测量的是守备中断时间，启动模块时间，退出模块时间和重启中断任务的时间总和。最小，典型和大的中断响应时间反映了从单个I/0模块接收到输入脉冲到中断块中第一行逻辑执行时刻的时间间隔。只有系统内没有智能选择模块并且编程器没有连接时才能达到小时间响应。执行中断块中的逻辑所需的时间会使C、

PU花更多的时间来进行I/O中断服务，这样会减小大中断速率。典型响应时间为小响应时间+大的中断反应时间。中断反应时间是正确的，除非发生以下情况:

■与编程器连接

存储逻辑，运行模式存储或者进行逐字替换时

发生故障(登入故障)时

发生另一个/0中断时

以上任何一个事件发生都会增大中断反应时间，使中断反应时间超出典型值。然而，由于前一个中断执行时间不确定，或者/0中断为极大的情况，所以中断反应时间不固定。坏的情况是系统中所有的/O中断同时发生，则后一个执行的中断必须等待其他中断执行完成才能执行

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