Code 202015: <location>Function generator: Drive enable signals missing
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Function generator: Drive enable signals missing 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: All objects Reaction: NONE Acknowledge: NONE Cause: The master control and/or enable signals are missing to connect to the specified drive. Alarm value (r2124, interpret decimal): Number of the drive object involved. See also: p4815 (Function generator drive number) Remedy: Fetch the master control to the specif ied drive object and set all enable signals. Note: The alarm is reset as follows: - remove the cause of this alarm. - restart the function generator. 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 202015 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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