Troubleshooting steps
Download missing OB block to CPU verify block exists in project
Siemens PLC
2534 – OB request error
OB call error – block not loaded
Details
An organization block was called but the block is not loaded in the CPU.
Error typeerror
MeaningOB not loaded
Typical causesBlock not downloaded to CPU missing from project OB deleted
SolutionsDownload missing OB block to CPU verify block exists in project
Severityhigh
Catalog references
Vendor Information
Siemens2534
Utilities
Troubleshooting Steps
Other codes
Other Siemens PLC Codes
FAQ
Common questions
How do I download an OB?
Use programming software to download the organization block to the CPU.