Code 17815: Indexing axis %1 fixed point %2 unequal indexing position
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Indexing axis %1 fixed point %2 unequal indexing position 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 %2 = Array index of machine data Definitions: The axis is a referenced indexi ng axis, and the fixed-point number %2 to be approached in JOG mode (defined in MD30600 $MA_FIX_POINT_POS) does not coincide with an indexi ng position. In JOG mode, referenced indexing ax es approach indexing positions. Reaction: NC not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Remedy: MD30600 $MA_FIX_POINT_POS[] or adapt the indexing positions. Program Continuation: Clear alarm with the RESET key. Restart part program
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 17815 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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