The method detects maximal time delay among members in same type in system automatically. Based on detected result, the method adjusts distance between read / write addresses of RAM automatically. Variational boundary position configured along writing direction is detected; and not readable section is setup along reading out direction. Through setting up the said distance and the not readable section, the method garurantees not losing data when adding member with time delay or resuming member with time delay after temporary deletion as well as controls time delay caused by module process in minimum zone.