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Siemens SINUMERIK Controller
Communication · Intermediate · 30-120 minutes
Siemens 4026 - Machine data [ ], link axis NC _AX not used by any channel
This alarm occurs when a link axis defined in machine data is not assigned to any channel, causing a configuration mismatch. Fix it by updating the machine data or channel assignment.
4026
Siemens 4026 - Machine data [ ], link axis NC _AX not used by any channel
Machine data, link axis NC_AX not used by any channel
The link axis is not referenced by any channel Control reaction: NC not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Alarms.
Root Cause Summary
This alarm occurs when a link axis defined in machine data is not assigned to any channel, causing a configuration mismatch. Fix it by updating the machine data or channel assignment.
Safety
- Only qualified personnel should diagnose and clear control alarms; follow the machine builder's safety procedures and lockout/tagout where hardware work is required.
Causes and Fixes
- 1
SAFETY: Power down and lock out system
Before accessing machine data, ensure the CNC system is in a safe state with emergency stops engaged and proper lockout/tagout procedures followed.
- 2
Check machine data
Access the machine data settings via the control panel and locate the link axis mentioned in the alarm (%1[%2]). Document current settings before making changes.
- 3
Assign axis to channel
Ensure the link axis is properly assigned to a channel in the configuration. Verify this change with machine documentation.
- 4
Reset and test
Save changes, create a backup of new configuration, reset the control, and test with a dry run program to confirm the alarm is cleared.
Call a technician if:
- ·If you are not authorized to modify machine data parameters
- ·If machine data changes do not resolve the issue
- ·If you are unsure about axis configuration requirements
- ·If this is a production-critical machine
Prevention
- Always backup machine data before making configuration changes
- Validate machine data and channel assignments during setup with qualified personnel
- Document axis configurations for reference
- Implement change control procedures for machine data modifications
Common Mistakes
- Overlooking the specific axis ID in the alarm message
- Failing to save changes after updating machine data
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Always verify with your machine manual or a certified technician before performing service procedures.