目前我们所使用的是Model:NT31C-ST14*-EV2; System Program: OMRON Direct Access (E) Version 3.23; Date: 2004-06-08。原来旧有的是NT30C, 当我将旧有的程序下载到NT31C后连接PLC,开始联机的时候就出现下面的讯息。"addess setting error, addressing error exists in the screen. correct address setting by the support tool, Screen No. 4, address 01421",请教您这个错误的讯息我应该从那里开始更正呢?