Hello....
If you have clear your NC and PLC problem should not come...does the back what you have is the right one....
If you have step7 goto diagnosis and see module information??? any error shows...
see in your hardware configuration any modules are not recognized..
Regarding the " NO WRITE ACCESS TO DATA " could you check the display MD there is information regarding the any thing may not be proper...
Check it.
Regards,
Prakash
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