CPU偶然一次死机，原因不明
死机报告如下：
Event?8?of?10:??Event?ID?16#?4563
STOP?caused?by?I/O?access?error?(OB?not?loaded?or?not?possible,?or?no?FRB)?
FB?number:??????7
Module?address:?????80
Previous?operating?mode:?RUN
Requested?operating?mode:?STOP?(internal)
Internal?error,?Incoming?event
10:08:21.861?PM??03/24/1994

Event?9?of?10:??Event?ID?16#?2942
I/O?access?error,?reading
P?area,?word?access,?Access?address:????326
Requested?OB:?I/O?access?error?OB?(OB122)
OB?not?found,?or?disabled,?or?cannot?be?started?in?the?in?the?current?operating?mode
External?error,?Incoming?event
10:08:21.858?PM??03/24/1994
PLC使用一个星期左右后，死机 该错误报告中外部I/O点错误指的是外部硬件的问题吗 还有PIW326 压根就没去定义 cpu为啥突然会去读这个点呢 这样的问题怎么解决