Siemens SIMATIC FM 452 Manual page 196

Data Blocks/Error Lists
Class 15: Messages
No. Meaning
Start of parameter assignment
1
Cause
End of parameter assignment
2
Cause
C-22
The module has detected a parameter assignment by
a system data block.
The module has processed the parameter assignment
by a system data block error-free.
Diagnostic
Interrupt
No
No
FM 452 Electronic Cam Controller
C79000-G7076-C452-04