Robotics in Manufacturing
SRVO-191

SRVO-191: Illegal Joint Speed

Internal motion error: the computed motion command exceeded specification.

What it means

Internal motion error: the computed motion command exceeded specification. Not a pendant-fixable condition - FANUC wants the diagnostic data.

Common causes

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

  1. Internal motion software condition.

How to fix it

  1. Diagnostic Log (FNCT > Diagnostic log) before any other operation, image backup, contact FANUC. Power-cycle to clear.

Quick facts

Category
System
Affected series
R-30iB; R-30iB Mate; R-30iB Plus; R-30iB Mate Plus
Alarm family
SRVO

Verified against FANUC documentation (B-83284EN-1).Last reviewed: 2026-07-09.Editorial process