Code 700255: Workpiece machined with new tool
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Workpiece machined with new tool 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
A tool has been used for the first time. a) PLC – MD 14510[6] Bit 5 = [ 1 ] (Without monitoring of workpiece machined with new tool after program end). b) PLC – MD 14510[6] Bit 5 = [ 0 ] (With monitoring of workpiece machined with new tool after program end). a) If a tool is used for the first time, there is no monitoring or display after the end of the program. b) Feed Stop after end of program (with M02, M30 or change work area/table side). Acknowledging the "newly inserted workpieces" with the [Acknowledge key] or [CYCLE START] key remains blocked. The error message appears and the lamp in the [Acknowledge key] key flashes quickly. b) 1. Submit workpieces for checking. 2. Confirmation (after OK from check) with the [FEED START] key. 3. Machining program is continued and the acknowledgement for the next workpieces is enabled again.
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 700255 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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