Code 14008: [Channel %1: ] Block %2 WRITE command writes in the temporary memory area in /_N_EXT_DIR
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 WRITE command writes in the temporary memory area in /_N_EXT_DIR 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 = Block number, label Definitions: A workpiece is executed from an exte rnal data register (Execute from external drives function). The part programs are temporarily stored in the NCK di rectory /_N_EXT_DIR. An attempt is now made to write in this temporary directory with a WRITE command. The alarm is intended to indicate that this data is not stored in the original directory on the external data carrier, and will be lost at the next part progra m selection because the programs in the directory /_N_EXT_DIR will then be deleted. Reaction: Alarm display. Remedy: State a directory that remains permanently loaded in the NCK as the target for the WRITE command (e.g. MPF_DIR). The alarm can be suppres sed with MD11415 $MN_SUPPRESS_ALARM_MASK_2 bit 8. 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 14008 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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