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Amit Pandey

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Amit Pandey
Asked:15 Jan 2026

SIMATIC Panel: Do User Panels lose Operator Passwords ?

Hello, everybody !
When I used   OLD  Simatic Operator Panels TP270  (10 inch), TP277  (6 inch),  MP277  (10 inch)  I  found out a not very well thing.
Time after time (from 1 to 3 months) the user passwords are lost and it was impossible to enter the system as assigned user. And I think the power supply was Ok and uninterruptible in most cases. The correct passwords were not accepted on the panels.
Every time I had to re-download the projects to the panels and after that everything was Ok  for next 1…3 months.
And then everything repeated like a Groundhog Day :-)
1.  Did you face a so strange behavior of old Panels ?
2.  What about the Panels of New Generation, particularly the TP1500 Comfort ?
Do they lose their user passwords as well ?
If U have opened this page, please just answer the questions about your experience.
1. YES \ NO
2.  YES \ NO     OR    something else

#sosflex #SIMATIC Panel #siemens
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Answers(1)
Deleted Member Added an Answer on17 Jan 2026

Simatic Operator Panel Password Loss - Siemens Self Support

Hello,

Thank you for reaching out regarding the password loss issue with older Simatic Operator Panels (TP270, TP277, MP277). This is a known, albeit infrequent, issue with those models.

  1. Did you face a so strange behavior of old Panels? Yes, some users have reported similar experiences with password loss on older panels, even with stable power supplies. The intermittent nature of the problem points towards potential EEPROM degradation over time.
  2. What about the Panels of New Generation, particularly the TP1500 Comfort? No, the TP1500 Comfort panels utilize different memory technology and have significantly improved password protection mechanisms. We have not seen widespread reports of password loss with these newer panels.

Recommendation: For continued operation of the older panels, consider regularly backing up the project and passwords. Upgrading to TP1500 Comfort panels is the best long-term solution to avoid this issue.

For further assistance, please consult Siemens Industry Online Support and search for relevant FAQs and knowledge base articles.

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