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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 105042 - Block number not allowed !
Siemens SINUMERIK alarm 105042: Block number not allowed!. This alarm indicates an error condition in the NC program or control configuration that must be resolved before the operation can continue.
105042
Siemens 840D 105042 - Block number not allowed !
Block number not allowed !
Siemens SINUMERIK alarm 105042: Block number not allowed!. This alarm indicates an error condition in the NC program or control configuration that must be resolved before the operation can continue.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Common Causes
- Part program contains an illegal or unsupported command for the current machine configuration
- Parameter or machine data setting incompatible with the commanded operation
- Required option or function not enabled on this SINUMERIK control
- Incorrect axis assignment or configuration for the commanded function
- Software version or compile cycle version mismatch
Troubleshooting Steps
- 1Note the full alarm message including any parameter values shown (e.g., axis number, block number, channel).
- 2Identify the program block or operation that triggered the alarm.
- 3Review the SINUMERIK alarm manual for alarm 105042 to identify the specific cause and remedy.
- 4Check the relevant machine data parameters referenced in the alarm.
- 5If the alarm persists after correcting the program, contact Siemens technical support with the full alarm text and machine data backup.
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Always verify with your machine manual or a certified technician before performing service procedures.