DS0022
DUAL CHECK SAFETY IS NOT WORKED
Fanuc · Alpha i Series Servo Amplifier
What does DS0022 mean?
The Dual Check Safety function is unavailable because parameter No.1902#6 is set to 0. This disables a critical safety feature of the system, potentially reducing safety integrity.
Common Causes
- Dual Check Safety (DCS) function did not perform its verification task correctly.
- Safety signal path interruption between redundant safety circuits.
- Mismatched safety parameters in the DCS configuration.
- Failure in the redundant encoder or speed feedback system.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Set parameter No.1902#6 to 1 to enable the Dual Check Safety function.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc Alpha i Series Servo Amplifier