Code 6425: [Channel %1: ] Tool %2 cannot be placed in magazine %3 on location %4. Invalid definition of magazine!
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Tool %2 cannot be placed in magazine %3 on location %4. Invalid definition of magazine! 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 ID %2 = String (identifier) %3 = Magazine number %4 = Magazine location number Definitions: The desired tool motion command - triggered from t he MMC or PLC - is not possible. A movement request was issued to put the tool in a location wh ich does not satisfy the prerequisites for filling. The following causes for the error are possible: - Location is blocked or not free! - Tool type does not match the location type! - Tool possibly too large, adj acent locations are not free! - If a tool is to be loaded or unloaded, the lo ad/unload position must be of 'load location' type. - If a tool is to be loaded or unloaded, is the magazine in question linked to the load/unload location? See $TC_MDP1, $TC_MDP2. Reaction: NC Start disable in this channel. Interface signals are set. Alarm display. Diagnostics Manual (DAsl), 03/2009 Remedy: - Check whether the magazine data have been defined correctly. - Check whether there is still room in the magaz ine to add another tool; there may not be due to operating procedures. - Check whether a location type hierarchy is defined and whether it, for example, does not allow insertion of a type 'A' tool in a free location with type 'B'. - Check whether the magazine in question is linked to the load/unload location or whether a distance has been defined. - Check whether the load/unload pos ition is of 'load location' type. See also $TC_MPP1. 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 6425 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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