Code 205058: <location>Parallel circui t: VSM EEPROM versions differ
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Parallel circui t: VSM EEPROM versions differ 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: Parameter: %1 Drive object: A_INF, B_INF, S_INF, SERVO, VECTOR Reaction: NONE Acknowledge: IMMEDIATELY Cause: The EEPROM versions of the Voltage Sensing Modules (VSM) do not match. Fault value (r0949, interpret decimal): Parameter in which the first diffe rent version number was detected. Remedy: For parallel circuit configurations, only Voltage S ensing Modules (VSM) with identical EEPROM versions may be used. 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 205058 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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