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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-60 minutes
Siemens 840D 12490 - Channel block access permission level is not valid
The desired access authorization, programmed with the keyword REDEF, has not been set. The desired protection level is either beyond the permitted value range or the protection level change is not allowed. (The REDEF instruction is only executable in INITIAL_INI blocks on SINUMERIK 840D, P1 (6/94)).
12490
Siemens 840D 12490 - Channel block access permission level is not valid
Channel block access permission level is not valid
The desired access authorization, programmed with the keyword REDEF, has not been set. The desired protection level is either beyond the permitted value range or the protection level change is not allowed. (The REDEF instruction is only executable in INITIAL_INI blocks on SINUMERIK 840D, P1 (6/94)).
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Common Causes
- REDEF keyword used outside of INITIAL_INI blocks
- Access permission level value exceeds valid range for the machine configuration
- Attempting to change protection level when not authorized by machine parameters
- REDEF instruction used on SINUMERIK 828D or non-P1 840D firmware versions
- Incorrect syntax or parameter format in REDEF statement
Troubleshooting Steps
- 1Verify REDEF instruction is placed only within INITIAL_INI blocks in the part program; move any misplaced REDEF statements to the proper initialization section
- 2Check the programmed access permission level value against machine documentation to confirm it is within the valid range (typically 0-3 for most Siemens configurations)
- 3Review machine parameter settings that govern REDEF authorization; verify the current user or program has sufficient privileges to modify protection levels
- 4Confirm firmware version is SINUMERIK 840D P1 (6/94) or later; REDEF may not be supported on older firmware revisions or 828D models
- 5Examine the REDEF syntax in the program for correct format and parameter values; cross-reference with current machine documentation for proper command structure
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