Code 22071: [TO unit %1: ] Tool %2 is active, but not in the magazine area under consideration
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [TO unit %1: ] Tool %2 is active, but not in the magazine area under consideration 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 = -Not usedDefinitions: The alarm can only occur when the tool management f unction is active in the NCK. Either the language command SETTA has been programmed or the corresponding operator action has been carried out via MMC, PLC,.... The alarm can also be tr iggered automatically by the NCK in the wear grouping function. It is detected that more than one tool from the tool group (tools with the same name/identifier) has the status "active". The specified tool is either from a non-considered magazine, from a non-considered wear grouping, or from a non-active wear grouping in a buffer location (is neither magazine nor wear grouping). Reaction: Interface signals are set. Alarm display. Remedy: The alarm is intended for information purposes. If only one tool in a group can be active at a time for technological reasons or for reasons of display, the "active" status must be canceled for the tool causing the error. Otherwise, the alarm can be ignored or even suppressed via the MD11410 $MN_SUPPRESS_ALARM_MASK. Typical reasons of display are present, if the oper ator works with the function 'definite D numbers', which can be displayed on Siemens MMC in a definite form only, if exactly one tool from a tool group has the status 'active'. Before machining can be started or before t he SETTA (or corresponding MMC operation,...) language command is used, all tools of the magazine should have the status "not active". One option to achieve this is programmi ng SETTIA (or corresponding MMC operation,...). 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 22071 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.
Have a better solution?
Help the industrial community by sharing your repair experience for code 22071.
Need a searchable reference for more Siemens SINUMERIK 840D CNC manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026