6ES5928-3UA11

FAQS

• Which controller uses the 6ES5928-3UA11 CPU?
  This order number is the SIMATIC S5 CPU 928 used with the S5-135U programmable controller.
• Why is the existing S5 program backup essential?
  The CPU is a discontinued legacy product, so the approved program, parameter and memory record must be preserved before replacement.
• What rack information should be captured for a CPU 928 exchange?
  Record the S5-135U rack position, adjacent modules, interface connections, memory arrangement and current diagnostic state.
• Can an S5 CPU with a similar name be substituted directly?
  No. CPU type, memory, interfaces, program compatibility and rack configuration require documented engineering approval.
• What should be compared before loading the saved program?
  Confirm the full 6ES5928-3UA11 identity, installed memory and interface arrangement, then use the controlled project copy.
• How should the first restart be controlled?
  Restore the approved configuration, monitor diagnostics and outputs, and keep the process in the authorized commissioning state.
• Which functions should be checked after the CPU 928 starts?
  Verify program execution, communication, configured I/O response, interlocks and the intended machine or process sequence.
• What belongs in the final CPU replacement record?
  Document the CPU identity, program revision, rack configuration, diagnostics and the accepted controlled functional test.