Code 27002: Axis %1 test stop is running
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Axis %1 test stop is running 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: Proper functioning of the switch-off path is just bei ng tested by setting of the SGE "Test stop selection". Reaction: Alarm display. Remedy: The message serves only for user information. Program Continuation: Alarm display showing cause of alarm disapp ears. No further operator action necessary. The alarm will disappear automatically after ex piry of the delay time - defined in MD $MA_SAFE_PULSE_DIS_CHECK_TIME - and after removal of SGE "Test stop selection", if the control recognizes pulse suppression, i.e. the test has been completed successfully. An unsuccessful test can be recognized by alarm 27001 with error code 1005 or by alarm 27024.
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 27002 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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