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Code 14549: [Channel %1: ] Block %2 contour tool: impermissible programming. Code no. %3

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 contour tool: impermissible programming. Code no. %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 = Block number, label %3 = Error code Diagnostics Manual (DAsl), 03/2009 Definitions: Impermissible programming has been found for contour tools on active tool r adius compensation. The error cause is explained in detail by the error code. 1: In G code group 17, KONT is active during activation 2: In G code group 17, KONT is active during deactivation 9: In G code group 40, CUTCONOF is not active 10: Reprogramming of G41 / G42 in already ac tive tool radius compensation not permissible 20: Circle with more than one rotation not permissible 21: Ellipse (circle not in compensation level) 23: Involute not permissible 24: Several polynomials not permitted in one block only. These blocks coul d be created by e.g. COMPCAD or G643. 30: Preprocessing stop not permitted 41: Starting point of first compensation bloc k cannot be reached by anyone of the defined cutting edges 42: End point of last compensation block c annot be reached by anyone of the defined cutting edges Reaction: Correction block is reorganized. Local alarm reaction. Interface signals are set. Alarm display. NC Stop on alarm at block end. Remedy: Change NC program. 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 14549 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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