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Code 20065: [Channel %1: ] Master spindle not defined for geometry axes in JOG mode

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Master spindle not defined for geometry axes in JOG mode 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 Definitions: The displayed axis is to be trav ersed as geometry axis in JOG mode with rotary feed, but no master spindle has been defined from whic h the actual speed could be derived. Reaction: Local alarm reaction. Interface signals are set. Alarm display. Remedy: If the revolutional feedrate is to be active in JOG mode too, then a master spindle must be declared in the channel-specific machine data MD20090 $MC_SPIND_DEF_MASTER_SPIND. In this case, you have to open a screen in the PARAMETER ope rating area with the softkeys "SETTINGDATA" and "JOG DATA", and preselect the G function G 95 there. The JOG feedrate can then be entered in [mm/rev]. (If 0 mm/rev is set as JOG feedrate, the c ontrol takes the value assigned in the axis-specific machine data MD32050 $MA_JOG_REV_VELO or in t he case of rapid traverse override MD32040 $MA_JOG_REV_VELO_RAPID). The revolutional feedrate in JO G mode is deactivated by changing t he G function from G95 to G94. 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 20065 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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