Code 17192: [TO unit %1: ] Invalid tool designa tion of '%2', duplo no. %3. No more replacement tools possible in '%4'.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [TO unit %1: ] Invalid tool designa tion of '%2', duplo no. %3. No more replacement tools possible in '%4'. 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 = TO unit %2 = Tool identifier %3 = Duplonummer %4 = Group identifier Definitions: The tool with the specified tool identifier, dupl o number cannot accept the group identifier. Reason: The maximum number of replacement tools allo wed has already been defined. The name allocation causes the tool to be reallocated to a tool gr oup which already contains the maximum number of replacement tools allowed on this machine. Reaction: Interface signals are set. Alarm display. Remedy: Use fewer replacement tools or request a different maximum setting from the machine manufacturer. 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 17192 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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