Troubleshooting steps
Check diagnostic buffer verify module connections review memory diagnostics check hardware
Siemens PLC
804C – Memory/Module error
Memory or module error detected
Details
Memory or module error 804C. Check system memory and expansion modules.
Error typeerror
MeaningMemory/Module error
Typical causesMemory fault module fault hardware fault configuration error
SolutionsCheck diagnostic buffer verify module connections review memory diagnostics check hardware
Severityhigh
Catalog references
Vendor Information
Siemens804C
Utilities
Troubleshooting Steps
Related
Related Siemens PLC Codes
FAQ
Common questions
Where do I find diagnostics?
Use TIA Portal diagnostic buffer or CPU diagnostic LEDs to view error details