P area

jitu

Dear Sir ,

I have p area error in s7 300,
What is p area ?
thanks

If OB85 has not been programmed, the CPU changes to STOP mode when one of these events is detected.
(From the System and Standard Functions manual)

It also indicates that OB85 is called because there is an access error to Input modules with adresses 0 to 7 and Output modules with addresses 0 and 1.


Now your second attachment shows all your modules, both on the CPU rack and on the Profibus slaves:

-Input addresses 0-2-3-4 are allocated to slave 15
-Input addresses 1-5-6-7 are allocated to slave 16

-Output address 0 is allocated to slave 15
-Output address 1 is allocated to slave 16

So your problem seems to be located in these 2 slaves. The CPU is complaining that it cannot access the modules when it does itss read/write tio the process image table.

Is there any diagnostic on those slaves, as far as trhe Profibus-DP connection is concerned? The master would call an OB86 which you don't show, so maybe not. In any case, the diagnopstics point to this section to be the source of your problems.

Hope this helps,
Daniel Chartier

jitu:

After looking at the attachments, the reason for the errors is because Profibus DP slaves 15 and 16 are not communicating with DP master.

To find out the reason why they are not communicating, in the HW config go online. You'll see a red "mark" on slaves 15 & 16. Right click on these slaves and then click on module information.

The "P area" (in thediagnostic buffer) in this contextmeans periphery, as explained by Pegaia before.

Regards