S7-300 Event Error

Hi All
I'm from an Allen-Bradley background and am having my first experience of Siemens. I have an S7-314 that I keep needing to manually cycle the Run/Stop switch to get it into run. Looking into the diagnostics I get the following error:

1 of 351;
Event ID: 16# 3842
Module OK
Module type: Distributed I/0s
Input address: 2042
Channel information available
Requested OB: Diagnostic interrupt OB (OB82)
OB not found, or disabled, or cannot be started in the in the current operating mode
7/15/1994 17:36:13.322

Can anyone guide me where to look to solve this? Thanks,

Ben

Download OB82, We always put OB80,82,83,85,86,87 in our projects.

Exactly, put empty OB blocks mentioned above to PLC - it won't stop but still report the error.

Cheers guys. I'm going to sound really thick here, but I have no clue what OB blocks are?

Organization blocks.

this document should explain alot. http://www.infoplc.net/files/descargas/siemens/infoplc_net_sitrain_12_obs.pdf

OK, I understand what you mean now, I've created the OB82, so i'll see what extra info I get when the fault occurs again. Thanks,

The solution for keeping the plc in run is downloading ob82 but you have to look for the fault at your distributet I/O's address 2042. Maybe bad power connections/lov voltage, bad network or faulty hardware..

Jonas

OK guys, i've just been back to site and i'm getting the following error: Does this suggest and error with the profiNET connections?
6 of 377;
Event ID: 16# 39CB
PROFINET IO: station Failure
address of the affected station: Input address: 2042
IO system ID: 100
station number: 1
Log. Basic address of the IO controller: 2043
Requested OB: Rack failure OB (OB86)
Priority class: 26
7/17/1994 05:01:22.275

OK, I think I found the issue, a dodgy CAT5 cable.