Code 120011: Request for authority to operate from another station.%nTo retain authority to operate=>Recall key,%nto transfer authority to operate=>wait (no entry)
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Request for authority to operate from another station.%nTo retain authority to operate=>Recall key,%nto transfer authority to operate=>wait (no entry) 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
Definitions: The operator of another station requests authority to operate. This can be refused to him through Recall. After approx. 5 seconds, the authority to operate will automatically be transferred to the other station. Reaction: Alarm display. Remedy: The alarm automatically disappears a fter approx. five seconds or if t he Recall key is pressed within this time limit. Program Continuation: Internal
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 120011 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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