Code 22066: [Channel %1: ] Tool management: Tool change is not possible as tool %2 is not in magazine %4.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Tool management: Tool change is not possible as tool %2 is not in magazine %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 = Channel number %2 = String (identifier) %3 = -Not used%4 = Magazine no. Definitions: The desired tool change is not possible. The specifie d tool is not contained in the specified magazine. (NCK cannot contain tools that are not assigned to a magazine. With this kind of tool, no operations (motion, change) can be performed.) Reaction: NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Remedy: Please inform the authorized personnel/service department. - Check that the specified tool is contained in the desired magazine, or program another tool to be changed. - Check whether the settings in machine data MD20110 $MC_RESET_MODE_MASK, MC20112 $MC_START_MODE_MASK and the associated machine data MD20122 $MC_TOOL_RESET_NAME match the current definition data. 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 22066 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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