SRVO-091
Line Tracking Pulsecoder Communication CRC Error
Fanuc · R-30iB Mate + Mate Plus Robot
What does SRVO-091 mean?
Communication between the Pulsecoder and the line tracking board is abnormal, specifically indicating a Cyclic Redundancy Check (CRC) error. This means data sent between the components is corrupted or inconsistent.
Common Causes
- Line tracking pulsecoder serial data CRC check failure.
- Corrupted data packets from the line tracking pulsecoder.
- Noise on the communication line causing data bit errors.
- Faulty line tracking pulsecoder generating incorrect CRC values.
- Intermittent connection in the line tracking pulsecoder communication wiring.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check the connection cable at each end (the line tracking board and the Pulsecoder).
- 2
Check whether the shielding of the connection cable is securely connected to the grounding plate.
- 3
Replace the Pulsecoder.
- 4
Replace the line tracking cable.
- 5
Replace the line tracking board.
Verified technical data. Last updated: March 2026
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Source: Fanuc R-30iB Mate + Mate Plus Robot