Code 207552: <location>Drive encoder: Encoder configuration not supported
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Drive encoder: Encoder configuration not supported 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 encoder configuration is not supported. Only bits may be requested in p0404 that are signaled as being supported by the encoder evaluation in r0456. Fault value (r0949, interpret decimal): Low word low byte: Encoder data set number Low word high byte: Component number High word: The encoder evaluation does not support a function selected in p0404. 1: sin/cos encoder with absolute tr ack (this is supported by SME25). 3: Squarewave encoder (this is supported by SMC30). 4: sin/cos encoder (this is supported by SMC20, SMI20, SME20, SME25). 12: sin/cos encoder with reference mark (this is supported by SME20). 15: Commutation with zero mark for separatel y-excited synchronous motors with VECTORMV. 23: Resolver (this is supported by SMC10, SMI10). 65535: Other function (compare r0456 and p0404). See also: p0404 (Encoder configuration effect ive), r0456 (Encoder configuration supported) Remedy: - check the encoder parameterization (p0400, p0404). - use the matching encoder evaluation (r0456).
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 207552 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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