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Code 4345: [Channel %1: ] Invalid configuration in chained transformation no. %2

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Invalid configuration in chained transformation 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 = Transformation number Definitions: A chained transformation is incorrectly co nfigured (MD24995 $MC_TRACON_CHAIN_1 or MD24996 $MC_TRACON_CHAIN_2). The following causes for the error are possible: - The list of transformations to be chained starts wi th a 0 (at least one entry not equal to zero is required). - The list of transformations to be chained contai ns the number of a transformation which does not exist. - The number of a transformation in the list is great er than or equal to the number of the chained transformation. Example: The cascaded transformation is the fourth transformation in the system, i.e. MD24400 $MC_TRAFO_TYPE_4 = 8192. In this case, only values 1, 2 or 3 may be entered in the associated list (e.g. MD24995 $MC_TRACON_CHAIN_1[...]). - The chaining setting is invalid. The following rest rictions currently apply. A maximum of two transformations can be chained. The firs t transformation must be an orientation transformation, transmit, peripheral curve transformation or inclined axis. The second transform ation must be the inclined axis transformation. Reaction: Correction block is reorganized. Interface signals are set. Alarm display. NC Stop on alarm at block end. Remedy: Set a valid transformation chain. 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 4345 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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