我目前有套西门子系统是314 的整个系统总是报错！SF亮  CPU STOP 

CPU断电重启恢复正常，几个小时后，SF亮  CPU STOP ！

程序里有OB122 ，且报的访问错误地址硬件组态里有，每次报的错误地址不一样。系统已经正常运行2年，最近才出现的！

我没招了，想请各位专家！帮我个忙！

Event 46 of 160:  Event ID 16# 4357

Module monitoring time started

Operating mode: STOP (internal)

Incoming event

09:23:38.650 AM  01/02/1994

Event 47 of 160:  Event ID 16# 4548

STOP caused by I/O management

Previous operating mode: RUN

Requested operating mode: STOP (internal)

Internal error, Incoming event

09:23:38.433 AM  01/02/1994

Event 48 of 160:  Event ID 16# 2942

I/O access error, reading

P area, word access, Access address:    302

Requested OB: I/O access error OB (OB122)

Priority class:  1

External error, Incoming event

09:23:38.433 AM  01/02/1994

Event 49 of 160:  Event ID 16# 2942

I/O access error, reading

P area, word access, Access address:    300

Requested OB: I/O access error OB (OB122)

Priority class:  1

External error, Incoming event

09:23:38.433 AM  01/02/1994

Event 50 of 160:  Event ID 16# 2942

I/O access error, reading

P area, word access, Access address:    298

Requested OB: I/O access error OB (OB122)

Priority class:  1

External error, Incoming event

09:23:38.432 AM  01/02/1994