Code 700041: Workpiece changer not locked/down
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Workpiece changer not locked/down 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
Actuation "Lock workpiece changer" is output, but there is no response from the corresponding sensor. PLC input signal "Workpiece changer locked" is not registered. The error has the following effect: Feed Stop No axis movements possible. Read disable Control reads no further program blocks into memory. If the sensor signals are correct within a monitoring period, the program run is continued. After the monitoring time has elapsed, the machine stops. 1. Check the sensor "Workpiece changer locked" and the associated PLC input signal. 2. Check the actuation and the valve "Lock workpiece changer". 3. As soon as the malfunction is remedied, press one of the following keys: [FEED START] [CYCLE START] Message is cleared and the machining program can be continued. The workpiece changer can be moved to its home position with the service function M90 and M271 as far as the switches signal OK again. Chapter 2.11 ‘Workpiece change’ on page 12
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 700041 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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