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SIMATIC S7-1500: Why it's difference

Hi All,
I has a problem today, and I can't understand.
I have a project with a cpu 1517-3 PN, and a CM1542-1.
Since the beginning, I connected to the CM1542 for Online.
Today I connected directly to the CPU's port, and TIA detected difference program.
I don't know why, cause the program it's the same, and I checked If I conected a new on the CM, No difference.
Do you have some ideas ?
Mike

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