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问：SIEMENS S7-200PLC写的一个大型的程序，假如在程序的中间有个M 点被置位，请问这个M 点下面的所有的触头是马上动作呢？还是等到下一个扫描周期才开始动作啊？
M 点下面的所有的触头 意思是CPU刚好执行到M点的线圈被置位这个网络，M点所有的触头都在这个网络的下面，还没有被执行到。
答：m点置位后,后面的程序中m点变成1,如果在后面程序中对m点再置零,则置零点后面的程序中m点又变为0在程序中被使用,即m点在程序中可以被多次反复置位或清零,mb,mw,md也都可以在程序中被多次赋值,而新值立即生效,使用时请注意.
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