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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 20-40 minutes
Siemens 840D 12261 - Channel block initialization of not allowed
Frame type variables cannot be initialized in the definition. Example: DEF FRAME LOCFRAME = CTRANS(X,200) Equally, no default values can be programmed for axes in the program run during field initialization via SET. A REDEF instruction with PRLOC is only permitted for setting data, but not for machi
12261
Siemens 840D 12261 - Channel block initialization of not allowed
Channel block initialization of not allowed
Frame type variables cannot be initialized in the definition. Example: DEF FRAME LOCFRAME = CTRANS(X,200) Equally, no default values can be programmed for axes in the program run during field initialization via SET. A REDEF instruction with PRLOC is only permitted for setting data, but not for machi
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Common Causes
- Attempting to initialize frame type variables directly in DEF statement instead of using separate assignment
- Programming default values for axes during field initialization via SET instruction
- Using REDEF instruction with PRLOC for purposes other than setting data
- Mixing frame initialization with machine initialization in the same program block
- Incorrect syntax in frame definition - trying to assign transformations at declaration time
Troubleshooting Steps
- 1Review the program at the specified channel and block number to identify the frame initialization statement causing the error
- 2Separate frame variable declaration from initialization - declare the FRAME variable first, then assign transformation values in a subsequent statement
- 3Remove any transformation functions (CTRANS, ATRANS, etc.) from the DEF statement; move these to post-declaration assignment statements
- 4Verify SET instructions are not attempting to assign default axis values - use only for setting machine data, not field initialization
- 5Check REDEF statements with PRLOC parameter are used only for setting data updates, not for initialization during machine startup
- 6Consult the program syntax against Siemens 840D/828D documentation for proper frame definition and assignment patterns
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