S7-300系统经常出现停机报警，AI模块也坏了几块了（334），CPU的报警记录谁能帮忙解释一下，在此先谢谢了。

Event 1 of 100: Event ID 16# 4563
STOP caused by I/O access error (OB not loaded or not possible, or no FRB)
Breakpoint in user program: Cyclic program (OB1)
Priority class: 1
FC number: 105
Module address: 46
Previous operating mode: RUN
Requested operating mode: STOP (internal)
Internal error, Incoming event
10:02:31:563 pm 09/18/10


Event 2 of 100: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 280
Requested OB: I/O access error OB (OB122)
OB not found, or disabled, or cannot be started in the current operating mode
External error, Incoming event
10:02:31:553 pm 09/18/10


Event 3 of 100: Event ID 16# 4302
Mode transition from STARTUP to RUN
Startup information:
- Startup with modified system configuration
- Difference between setpoint and actual configuration
- Time for time stamp at the last backed up power on
- Single processor operation
Current/last startup type:
- Automatic warm restart after backed up power on
Permissibility of certain startup types:
- Manual warm restart permitted
- Automatic warm restart permitted
Last valid operation or setting of automatic startup type at power on:
- Automatic warm restart after backed up power on
Previous operating mode: STARTUP (warm restart)
Requested operating mode: RUN
Incoming event
10:02:31:538 pm 09/18/10


Event 4 of 100: Event ID 16# 1382
Request for automatic warm restart
STOP due to: STOP caused by I/O access error (OB not loaded or not possible, or no FRB)
Startup information:
- Startup with modified system configuration
- Difference between setpoint and actual configuration
- Time for time stamp at the last backed up power on
- Single processor operation
Current/last startup type:
- Automatic warm restart after backed up power on
Permissibility of certain startup types:
- Manual warm restart permitted
- Automatic warm restart permitted
Last valid operation or setting of the automatic startup type at power on:
- Automatic warm restart after backed up power on
Requested OB: Startup OB (OB100)
Priority class: 27
Incoming event
10:02:31:537 pm 09/18/10


Event 5 of 100: Event ID 16# 5961
Parameter assignment error in CPU module parameters
Parameter: module type
Output address: 44 of the module with parameter assignment errors
Error type: configurable slot empty
Operating mode: STARTUP (warm restart)
External error, Incoming event
10:02:31:302 pm 09/18/10