Code 129943: %1: Invalid configuration of $AN_TIMER.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical %1: Invalid configuration of $AN_TIMER. 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 = NCU name Definitions: Setting AN_TIMER_Nr of section [DAT] in ITS.INI is incompatible with the setting in machine data 18710 $MN_MM_NUM_AN_TIMER. Remedy: The value in general machine data 18710 $MN_MM_NUM_AN_TIMER must be at least "1". The value set for AN_TIMER_Nr of section [DAT] in ITS.INI must be higher than "0" and smaller than or equal to the value of general machine data 18710 $MN_MM_NUM_AN_TIMER. The following rule applies: 0 < AN_TIMER_Nr <= $MN_MM_NUM_AN_TIMER
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 129943 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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