Code 207481: <location>EPOS: Axis positi on < software limit switch minus
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>EPOS: Axis positi on < software limit switch minus 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: Drive object: SERVO, VECTOR Reaction: OFF1 (OFF2, OFF3) Acknowledge: IMMEDIATELY Cause: The current position of the axis is less than t he position of the software limit switch minus. Remedy: - correct the target position. - change software limit switch minus (CI: p2578, p2580). See also: p2578 (EPOS software limit switch minus si gnal source), p2580 (EPOS software limit switch minus), p2582 (EPOS software limit switch activation)
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 207481 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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