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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 6698 - Unknown NC card ( / ). Writing not possible.
Alarm 6698 occurs when the NCK cannot identify the NC card type or lacks the appropriate flash write algorithm for the installed memory module. This prevents firmware updates or parameter writes to the card's flash memory, typically affecting PCMCIA/CompactFlash storage cards used in 840D systems.
6698
Siemens 6698 - Unknown NC card ( / ). Writing not possible.
Unknown NC card (/). Writing not possible.
The NC card cannot be accessed because a valid write algorithm is not available for the flash memory Control reaction: Alarm display.
Root Cause Summary
Alarm 6698 occurs when the NCK cannot identify the NC card type or lacks the appropriate flash write algorithm for the installed memory module. This prevents firmware updates or parameter writes to the card's flash memory, typically affecting PCMCIA/CompactFlash storage cards used in 840D systems.
Safety
- Only qualified personnel should diagnose and clear control alarms; follow the machine builder's safety procedures and lockout/tagout where hardware work is required.
Causes and Fixes
- 1
Access Diagnostics via HMI: Navigate to Machine > Diagnostics > Hardware Information > Storage Media to identify the NC card type and firmware version currently detected by the NCK.
- 2
Compare the detected card model against the Siemens approved NC card list in the 840D hardware documentation. Verify the card is on the support matrix for your current NCK software version (check via Diagnostics > Software > NCK Version).
Non-approved or counterfeit NC cards will trigger this alarm and must be replaced with genuine Siemens-certified cards.
- 3
If the card is listed as compatible, attempt a Firmware Flash Update via HMI > Service > Software > Flash to download the latest write algorithm and device driver for the NC card. This may resolve recognition issues.
Ensure stable power supply and no active machining during flash update to prevent card corruption.
- 4
If unrecognized card persists after update, replace the NC card with a Siemens-approved alternative (typically Transcend or Panasonic PCMCIA CompactFlash certified for 840D/810D systems).
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