Code 207562: <location>Drive, encoder: Positi on tracking, incremental encoder not possible
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Drive, encoder: Positi on tracking, incremental encoder not possible 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: Fault cause: %1, component number: %2, encoder data set: %3 Drive object: SERVO, VECTOR Reaction: OFF2 (IASC/DCBRAKE, NONE, OFF1, OFF3, STOP1, STOP2) Acknowledge: IMMEDIATELY (POWER ON) Cause: The requested position tracking for incremental encoders is not supported. Fault value (r0949, interpret hexadecimal): ccccbbaa hex aa = encoder Data Set number bb = component number cccc = fault cause cccc = 00 hex = 0 dec The encoder type does not support the "Pos ition tracking incremental encoder" function. cccc = 01 hex = 1 dec Position tracking cannot be activated because the me mory of the internal NVRAM is not sufficient or a Control Unit does not have an NVRAM. cccc = 04 hex = 4 dec A linear encoder is used that does not support the position tracking function. See also: p0404 (Encoder configuration effect ive), p0411 (Measuring gear, configuration), r0456 (Encoder configuration supported) Remedy: - check the encoder parameterization (p0400, p0404). - use a Control Unit with sufficient NVRAM. - if required, deselect position tracking for the incremental encoder (p0411.3 = 0).
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 207562 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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