Code 7202: Missing option bit for %1: %2 <hex>
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Missing option bit for %1: %2 <hex> 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
Parameters: %1 = (string) name of the specific.elf file %2 = (int) required option bit (hex) Definitions: Alarm for SIEMENS compile cycl es. This alarm appears when the option bit required for a SIEMENS compile cycle is not set. Reaction: NC not ready. Channel not ready. Interface signals are set. Alarm display. Alarm reaction delay is cancelled. Remedy: Set the required option bit or delete the.elf file from the Flash File System. Program Continuation: Clear alarm with the RESET key in all channels. Restart part program.
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 7202 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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