I would suggest you replace it to 6ES7 151-1AA05-0AB0 . At a forum in Russia, many discussed the problem of sudden (random)disconnection from the bus (Profibus)these modules. Nothing is certain, for reasons no one could say. I'm in my laboratory investigated the three modules with a similar defect. None of them within a week not be repeated. After you submit the audited units to the customer, he has these problems were repeated. now installed new modules 6ES7 151-1AA05-0AB0 . So far no problems.
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