IO access error-Exernal fault

Hi,

We have an S7400 CPU 415HM, everything works perfect except some external fault occuring 3-4 times a day recently. There are some sub systems via profibus and the diag buffer says " IO access error writing, P area double word access adress 178. So I tried to search any PQW,PDW or PIW with ad 178 range but I couldnt find anything. Since the fault occuring for milliseconds not able to trace where it happens. any solution or suggestions would be he highly appreciated. Attached the screenshot and if I missed to brief something please ask

Regards

Sandy

sandy1984

Hi,

We have an S7400 CPU 415HM, everything works perfect except some external fault occuring 3-4 times a day recently. There are some sub systems via profibus and the diag buffer says " IO access error writing, P area double word access adress 178. So I tried to search any PQW,PDW or PIW with ad 178 range but I couldnt find anything. Since the fault occuring for milliseconds not able to trace where it happens. any solution or suggestions would be he highly appreciated. Attached the screenshot and if I missed to brief something please ask

Regards

Sandy

 Hi

Can you send a screenshot of HW configuration in online mode ?

Hi,

After spending some time I could not find the address any where but the block FC6 (DP recieve) has been used in another FC to fetch some data (issue happens due to this location i suspect). I found only  IW178 which is moving to some DB...am wondering if this is the reason?. Attached the screenshot of program

Regards

Sandy

Hello,

It's about "I/O access error writing", so you should search for QW178.

IW178 is reading inputs.

Best regards,

Wizard

Hi,,

Yes I searched for PQW17 or QW178 in reference editor but could not find it...is there any other way to search this??

Regards

Sandy

Hello,

When looking in diagnostic buffer, it looks like the problem is in FC6

Best regards,

Wizard

Attached the Diag buffer from the system

Hi,

FC6 is DP_RECV and it has been called in another FC. Everything is working fine and it was good for years..recently this issue started. now I have found the two CP card which is used for DP communcation and attached the pdf file. but the address 178 is no where mentioned

Regards

Sandy

Hello,

In hardware configuration, you find no QW178?

Perhaps the DP/DP couplers use it?

Best regards,

Wizard

Hi,

no either in HW config or reference editor QW178 not used also checked the DP coupler.... 

Regards

Sandy