Code 510126: Tool change not finished
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Tool change not finished alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
The command for a tool change has been output, but the change was not completed within a monitoring time of about 20 seconds. The error has the following effect: Feed Stop No axis movements possible. Read disable Control reads no further program blocks into memory. Error messages Tool change Tool change not finished 1. Observe additionally pending error messages. 2. Once the malfunction has been remedied, press [RESET] key Message is cleared. This message serves as information that the error displayed has occurred during a tool change.
Source: CHIRON Error Message Overview, all series (Siemens control, V2.0.6, 2012)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Chiron Siemens-Control CNC Alarms
Chiron controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 510126 on the Siemens-Control CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Chiron's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 545 Chiron Siemens-Control CNC codes.
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