HI Greeting to all,

First of all let me tell you that since I was not able to find out the exact and clear reasons for my problem hence I posted this question again.

I have a CPU 315-2DP. The customer changed the CPU with the new one because the machine used to stop automatically and they couldn't find the reason.

Now I extracted some information from the "DIAGNOSTIC BUFFER" and below is the message that I found.

Event 1 of 109: Event ID 16# 4302
Mode transition from STARTUP to RUN
Startup information:
- 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

Event 2 of 109: Event ID 16# 1382
Request for automatic warm restart
STOP due to: STOP due to I/O management
Startup information:
- Startup without modified system configuration
- No 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

How can I solve this "STOP DUE TO I/O MANAGEMENT" problem. The customer is facing this problem since last 3 years but now this problem is coming regularly (twice a day) which effects their process.

Your expertise required.

Regards

I have the same problem with cpu 315-2dp with 2 expansion rack 

It goes to stop with fault i/o management 

I tired everything i can check wiring psu o/p voltage and earthing 

After i add ob 122. It give me i/o access error but with old dates 

any one can help me 

Export the diagnostic buffer and post it here.

Diagnostic buffer of module CPU 315-2 DP