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Code 17262: [Channel %1: ] Block %2 illegal tool adapter operation

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 illegal tool adapter operation 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 Diagnostics Manual (DAsl), 03/2009 Definitions: If an attempt is made to define or cancel a tool adapter assignment with reference to a magazine location and this magazine location already has another tool adapter and/or a tool is located in the adapter or - when canceling an assignment - a tool is still at the location, this alarm will appear. If machine data MD18108 $MN_MM_NUM_SUMCORR has the value -1, adapters cannot be generated by a write operation to an adapter which is not already defined. While the machine data has this value, you can only write adapter data to adapters which have al ready been (automatically) assigned to magazine locations. Reaction: Correction block is reorganized. Interface signals are set. Alarm display. Remedy: - Assign max. one adapter to a magazine location. - The magazine location must not contain a tool. - MD18108 $MN_MM_NUM_SUMCORR has value -1: If an alarm occurs when writing one of the system variables $TC_ADPTx (x=1,2,3,T), the write operation must be modified such that only adapter data which are already associated with the magazine locations are written. Program Continuation: Clear alarm with NC ST ART or RESET key and continue the 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 17262 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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