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S7-200规定中断优先级从高到低依次为:通信中断、I/O中断、定时中断。每种中断类型中的不同中断事件具有不同的优先级，如表2所示。
一个程序中可以有128个中断。S7-200根据先来先服务的原则为各自优先级组中的中断提供服务。任何时候只能执行一个中断程序。一旦一个中断程序开始执行，它将一直执行到结束。不能被另一个中断程序中断，即使它是一个更高优先级的中断程序。在中断程序执行期间，新的中断请求根据优先级排队。中断队列中可以存储的中断数是有限的，超过了就会溢出。中断队列的最大中断数和溢出标志位如表3所示。
(1)每个高速计数器都有一个32位的当前值和一个32位的预设值，这两个值都是有符号的整数值。要设置高速计数器的新电流值和新预设值，有必要设置控制字节(表6-7 ),以便第五位和第六位为1，允许更新预设值和电流值，并将新电流值和新预设值写入专用内部标志位存储区。然后执行HSC指令，将新值传输到高速计数器。当前值和预设值占用的特殊内部标志位存储区如表1所示。