Hello Gents,

I have some prolem my PLC S7 300

so CPU 314c-2DP  have alarm. 

diagnostic result OB122 error.

Kindly ask to you assist to fix problem.

for more information please check attached file.

mopS04

hi Eldar_esmu,

IO-access-error means that the CPU could not reach a projected periphery. Have a look to the module with the address that is mentioned in the diagnostic buffer. You can diagnose this module in particular by looking online in HW-config.

hope this helps,

regards,

p.s.: you can easily share the complete diagnostic buffer by using the "sava as.." button.

 Hi mopS04,

Thanks for reply,

could you please write instructuion step by step?

or can i send for you my plc project (archive)?

mopS04

It doesn´t help to send the project.

This is a behaviour that you have online. I don´t have the faulty HW that you have.

Look at the diagnostic buffer. In the entries you have information about the HW that makes the problems. go online in the HW-configuration and have a look to the HW that uses this addresses. If you don´t know what I mean, have a look at your own screenshot:

hope this helps,

regards,

 My friend thanks for you.

now i check diagnostic buffer and save all.