Code 20059: [Channel %1: ] Axis %2 already active due to %3
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Axis %2 already active due to %3 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 %3 = Cause Definitions: The axis (machine axis, geometry ax is or orientation axis) is to be traversed in operation mode "Automatic&Jog" (see MD10735 $MN_JOG_MODE_MASK) by using the direction keys or a handwheel. This is not possible, as (see parameter 3): 1. the axis is active as a rotating spindle 2. the axis is a PLC axis 3. the axis is active as an asynchronous reciprocating axis 4. the axis is active as a command axis 5. the axis is acti ve as a slave axis 6. a frame applies for a rotated coordinate system and an axis involved in the required JOG movement of the geometry axis is not available for this 7. an axis container rotati on is activated via NCU link Note: This alarm identifies an axis not capable of JOG which received a JOG order. In this case, the NCK will not proceed according to "Internal JOG". Reaction: Alarm display. Remedy: Wait for the axis to traverse or abor t with distance-to-go delete or RESET. 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 20059 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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