Siemens alarm 400254: Checksum error found: %1
SINUMERIK PLC system alarm · Siemens 840D/810D powerline
What it means
A checksum test detected corruption in safety-relevant PLC code or safety-relevant data; %1 identifies the code section or table concerned. The Safety Integrated monitoring functions implemented in the PLC may consequently be damaged or unreliable. Power the control OFF/ON immediately, and hand it to the service department if the error returns.
Likely causes
- Corrupted safety-relevant program/data in PLC load memory
- Failed or interrupted download of F-capable PLC project
- Hardware memory defect affecting F data
Triage note: Safety-relevant: do not keep operating the machine with this alarm active. Reaction: switch control OFF - ON.
Need the part urgently?
Send us alarm 400254 with your machine details — typical RFQ turnaround is 24–48h.