Code 700238: Tool not locked (1)
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Tool not locked (1) 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 "Clamp tool" was output, but the response from the monitoring function for "Tool clamped" is not correct. The tool has not been correctly clamped. 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 actuation of the valves "Unclamp tool" and "Clamp tool". 2. Check sensors and corresponding PLC - input signals. Check the voltage value of the analogue sensor. 3. Check the setting of the collet chuck and analogue sensor relative to the adjustment instructions. NOTICE! Adjustment should only be carried out by trained and instructed personnel. 4. As soon as the malfunction is remedied, press the following key: [FEED START] [CYCLE START] Message is cleared and the machining program can be continued.
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 700238 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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