Code 207443: <location>LR: Reference point coordinate not in the permissible range
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>LR: Reference point coordinate not in the permissible range 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: SERVO, VECTOR Reaction: OFF1 (OFF2, OFF3) Acknowledge: IMMEDIATELY Cause: The reference point coordinate received when adju sting the encoder via c onnector input p2599 lies outside the half of the encoder range and c annot be set as current axis position. Fault value (r0949, interpret decimal): Maximum permissible value for the reference point coordinate. Remedy: Set the reference point coordinate to a lo wer value than specified in the fault value. See also: p2598 (EPOS reference point coordinate, signal source), p2599 (EPOS reference point coordinate value) SINAMICS-Alarms Diagnostics Manual (DAsl), 03/2009
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 207443 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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