Code 27007: Axis %1 acceptance test mode is active
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Axis %1 acceptance test mode is active 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
Parameters: %1 = Axis number Definitions: Via the operator panel, an SI acceptance test has been started for example with the acceptance test wizard. The acceptance test mode is activated via the NCK and drive fo r the time of this acceptance test. In the acceptance test mode, SI PowerOn alarms can be acknowledged with the Reset key. Reaction: Alarm display. Remedy: Deselect the acceptance test, for example with the acceptance test wizard or wait until completed (acceptance test time can be parameterized via MD $MA_SAFE_ACCEPTANCE_TST_TIMEOUT). Program Continuation: Alarm display showing cause of alarm disapp ears. No further operator action necessary.
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 27007 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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