I have inherited a job where the customer previously had a company replace the EEPROM chips in all his processors. This replacement was recommended to allow for the new daylight savings times to be updated. They claim that they have experienced com failures and processor lock-ups ever since. I have run bus diagnostics and not shown excessive traffic or data collisions or failed packets. Then for whatever reason, a controller will lock up and take the entire bus down. It is never the same processor. I have also experienced problems connecting out in the field with my laptop and usually have to disconnect the controllers from the bus to stop the com failures from interfering with whatever I am doing.
Has anyone seen problems from the EEPROM replacements?