Code 206601: <location>Infeed: Current offset measurement interrupted
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Infeed: Current offset measurement interrupted 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
Message value: %1 Drive object: A_INF, B_INF, S_INF Reaction: NONE Acknowledge: NONE Cause: Defective current measurement or a DC current is present during the offset measurement. Alarm value (r2124, interpret decimal): 1: Excessively high phase current has occu rred during the current offset calibration. 2: The measured current offset is greater than the 3% of the maximum permissible converter current (e.g. due to a ground fault in the DC link). Remedy: Re alarm value = 1: - possible counter-measure if there is no line contactor: Power up an adequately long time before OFF1 = 1. Re alarm value = 2: - defective current measurement or a DC curr ent is present during the offset measurement. - check the DC link for a ground fault.
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 206601 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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