Code 20062: [Channel %1: ] Axis %2 already active
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Axis %2 already 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 = Channel number %2 = Axis name, spindle number Definitions: The displayed axis is al ready traversing as a machine axis. Th erefore, it cannot be operated as a geometry axis. Traversing an axis can take place in JOG mode through 2 different interfaces. 1. As a geometry axis: via the channel-specific interfac e DB21-30 DBX12.6 / 12.7 (Traversing keys /+) 2. As a machine axis: via the axis-specific in terface DB31,... DBX4.7 / 4.6 (Traversing keys plus/minus) With the standard machine control panel, it is not possible to operate an axis as a machine axis and as a geometry axis at the same time. Reaction: Alarm display. Remedy: Do not start the geometry axis until the tr aversing motion as machi ne axis has been concluded. Program Continuation: Clear alarm with the Delete key or NC START.
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 20062 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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