Fanuc alarm 911: SRAM PARITY : (BYTE 1)
system alarm · Fanuc 0i-D
What it means
RAM parity error in part-program storage SRAM (high byte)
Likely causes
- dead SRAM backup battery
- SRAM corruption
- defective SRAM device or main board
Triage note: Same triage as 910: battery -> SRAM clear/reload -> board swap; always back up parameters before touching battery
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A98L-0031-0012
Lithium Battery 3V (SRAM backup) · Primary suspect
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A20B-3300-0313
FROM/SRAM Module (16i/18i/21i) · Common cause
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A20B-8200-0740
Main CPU Board (0i-D) · Common cause
Need the part urgently?
Send us alarm 911 with your machine details — typical RFQ turnaround is 24–48h.