Code 4347: [Channel %1: ] Invalid channel axis assignment in machine data %2[%3]
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Invalid channel axis assignment in machine data %2[%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 = Name of machine data %3 = Transformation number Definitions: MD2.... $MC_TRAFO_AXIS_IN_... contains an invalid entry. The following causes for the error are possible: - The entry refers to a channel axis which does not exist. - The entry is zero (no axis) but the transformat ion needs the relevant axis as a channel axis. - More than one external axis has been entered in MD2.... $MC_TRAFO_AXIS_IN_... for the 7-axis transformation. Reaction: Correction block is reorganized. Interface signals are set. Alarm display. NC Stop on alarm at block end. Remedy: Correct the entry in MD2.... $MC_TRAFO_AXES_IN_... 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 4347 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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