Code 120006: The channel switchover is currently disabled by area %1.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical The channel switchover is currently disabled by area %1. 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 = Operating area name Definitions: The area %1 has disabled the channel switchover at the moment, as it is performing a critical operation (e.g. execution from external sources, et c.), during which no channel switchover may occur. Reaction: Alarm display. Remedy: Wait until the critical operation is fini shed or end the critical operation manually. Program Continuation: Internal
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 120006 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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