描述
DS200DCFBG1BLC
西门子S7-300PLC的累加器在语句表程序中扮演了极为重要的角色，几乎所有的指令操作都是在累加器中完成的。西门子S7-200PLC的4个32位累加器是象V存储器一样的存储单元。它可以存储8位、16位和32位的数据。可用它来向子程序传递参数，或者从子程序返回参数，或者存储计算的中间结果。也可以使用累加器存储或传递指针。使用累加器不用考虑数据长度的问题，用来保存运算的中间结果特别方便。S7-200的系统手册在讲系统对中断的支持时说：“由于中断指令影响触点、线圈和累加器逻辑，所以系统保存和恢复逻辑堆栈、累加寄存器以及指示累加器和指令操作状态的特殊存储器标志位(SM)。这避免了进入中断程序或从中断程序返回对主用户程序造成破坏。”这就是说，调用中断程序之前，累加器的数据被自动保存，调用结束后，保存的数据被自动恢复到累加器。因此在中断程序中使用的是另一套累加器！所以，累加器不能用来在主程序和中断程序之间传递数据。
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