Robotics in Manufacturing
MOTN-159

MOTN-159: Invalid joint data near singularity

The joint data for the indicated line is invalid.

What it means

The joint data for the indicated line is invalid. The recorded position may be near a singularity point where the robot's configuration changes, which makes the joint data unusable.

Common causes

Ranked by what technicians most often find, most likely first.

  1. Recorded position sits at or near a singularity point.
  2. The configuration changed at the recorded point, leaving inconsistent joint data.

How to fix it

  1. Re-record the affected position data.
  2. When re-recording, keep the taught point away from the singularity.
  3. Avoid recording at the point where the configuration changes.

Quick facts

Category
Motion
Affected series
R-30iB; R-30iB Mate; R-30iB Plus; R-30iB Mate Plus
Alarm family
MOTN

Verified against FANUC documentation (B-83284EN-1).Last reviewed: 2026-07-12.Editorial process