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Code 4342: [Channel %1: ] Invalid machine data for general 5-axis transformation error no. %2

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Invalid machine data for general 5-axis transformation error no. %2 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 = Error type Definitions: The machine data which describe the axis directions and the basic orientation and the input axes for the general 5-axis transformation are invalid. The er ror parameter displayed specifies the cause of the alarm: - 1: The first axis (MD2.... $MC_TRAF O5_AXIS1_...) is not defined (all three entries of the vector are 0) - 2: The second axis (MD2.... $MC_TRAFO5_AXIS2_...) is not defined (all three entries of the vector are 0) - 3: The basic orientation (MD2.... $MC_TRAFO5_BASE_ ORIENT_...) is not defined (all three entries of the vector are 0) - 4: The first and second axis are (virtually) parallel - 5: On MD2.... $MC_TRAFO_TYPE_ = 56 (rotatable t ool and workpiece) there is no 4-axis transformation, i.e. 2 rotary axes must always be available. (See MD2.... $MC_TRAFO_AXES_IN_...) - 6: The third axis (MD2.... TRAFO5$MC_TRAFO5_AXI S3_...) is not defined (all three entries of the vector are 0) (6-axis transformation) - 7: The normal tool vector (MD2.... TRAF O6$MC_TRAFO6_BASE_ORIENT_NORMAL_...) is not defined (all three entries of the vector are 0) (6-axis transformation) - 8: The basic tool orientation (MD2.... $MC_TRAF O5_BASE_ORIENT_...) and the normal tool vector (MD2.... $MC_TRAFO6_BASE_ORIENT_NORMAL_...) are (virtually) parallel (6 -axis transformation) - 9: The first external axis (MD2.... $MC_TRAFO 7_EXT_AXIS1_*) has not been defined (all three vector entries are 0) (7-axis transformation) -10: Invalid transformation type (MD2.... $MC_ TRAFO_TYPE_...). A transformation type unequal to 24 has been entered for the generic 7-axis transformation. Reaction: Correction block is reorganized. Interface signals are set. Alarm display. NC Stop on alarm at block end. Diagnostics Manual (DAsl), 03/2009 Remedy: Set valid machine data. 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 4342 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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