Error while downloading ladder pgm to CPU315-2DP

Hi
I using CPU 315-2DP in my project.There are 8 ET200m connected to this CPU.The central rack has a 16ptI/P card and a 16ptO/P card.
Each ET200M has 32ptI/p and 32ptO/P card.
I am using STEP7 V5.3+SP2 for ladder programming.
I get a error D280(error while compling so cant copy block) while downloading my program to the PLC.
My program has an OB1 which calls different functios.
I created a small program to test with 1 function called by OB1 still i have the same problem.
I compiled my program also.there is no error generated.Only when i go to download this error is generated.
While troubleshooting I discovered that when I use I128.0 onwards in my program this error is coming.
My IO addressing is from 0.0 to350.7
Can somone tell the reason for this error.
Why I am not able to use I128.0 onwards in my program.
Also need to know how to give IO address for distributed IO.

Thanks
Annie

that's probably because you cannot use directly I128.0... can you past a screenshot of your hw configuration?

Annie, your PLC supports 128 bytes of process image (byte0..byte127). I128.0 doesn't belong to this boundaries. You can use your addressing but you must to access IO area as PI and PQ.

Hi
My program is in office will send it tmr.
In the mean can u let me know how u need to access the address from
I128.0 in the program

I suggest you to translate IO outside the process image boundaries to M or DB. For example, you can define M128.0 as a mirror of I128.0 and use M128.0 in your logic. But you must to organize mirroring like this:
L PID128
T MD128
You cann't access immediate input like PI128.0. Peripheral inputs can be accessed as bytes, words and dwords only. I use double words because it's shorter and faster.

Change your hardware config and your program so that all digital i/o addresses are in the range 0.0 to 127.7