
axismd.ai
Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 101142 - MDx146< MDx142
Alarm 101142 indicates a machine data configuration error where MD 146 (maximum number of axes) is set to a value less than MD 142 (number of geometry axes). This creates a logical conflict as the system cannot have more geometry axes than total axes available. This alarm typically occurs during system configuration, machine data restoration, or after incorrect parameter modifications.
Siemens 840D 101142 - MDx146< MDx142
MDx146< MDx142
Siemens SINUMERIK operator message 101142: MDx146< MDx142. This is an informational message from the SINUMERIK control indicating a system status or operation result that may require operator action.
Root Cause Summary
Alarm 101142 indicates a machine data configuration error where MD 146 (maximum number of axes) is set to a value less than MD 142 (number of geometry axes). This creates a logical conflict as the system cannot have more geometry axes than total axes available. This alarm typically occurs during system configuration, machine data restoration, or after incorrect parameter modifications.
Safety
Causes and Fixes
Enter service mode and navigate to machine data: HMI > Commissioning > Machine Data.
Check value of MD 146 (max axes) and MD 142 (geometry axes) for the affected channel. Record both values.
Increase MD 146 to at least equal or greater than MD 142. Typically MD 146 should be set to the total number of configured axes (e.g., 5 for 5-axis machine).
Ensure new value matches actual hardware configuration and licensed axes count.
Perform NCK reset (Power On) to activate changes. Verify alarm clears and all axes are properly recognized.
Seeing Multiple Alarms?
Seeing another alarm with this one? Enter the code.
AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.
Start freeWas this guide helpful?
Always verify with your machine manual or a certified technician before performing service procedures.