I/0中断程序块可以由某些硬件输入的中断信号触发。例如，24 VDC,32回路的输入模块(IC697MDL650)，不管输入信号是上升沿还是下降沿，第一次输入时都发出一个中断。如果模块配置中将中断功能使能，则中断可以触发执行一个程序块。VO中断在程序块属性栏中配置，触发必须使用全局变量%l,%AI或者%AQ.模块中断如果在模块硬件配置中将VME中断参数使能，程序块可以由VME模块输入的中断信号触发。PAC系统CPU允许每个模块有一一个中断。

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