Robotics in Manufacturing
SRVO-081

SRVO-081: EROFL alarm (track encoder overflow)

Line-tracking alarm: the pulse count from the conveyor-tracking encoder overflowed - the tracking system counted faster or longer than it can handle, usually a conveyor running beyond the tracking limits.

What it means

Line-tracking alarm: the pulse count from the conveyor-tracking encoder overflowed - the tracking system counted faster or longer than it can handle, usually a conveyor running beyond the tracking limits.

Common causes

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

  1. Conveyor/encoder speed exceeding the line-tracking limitation.
  2. Faulty incremental encoder, tracking cable, or line tracking interface board.

How to fix it

  1. Check the tracking application against its limits; reduce conveyor speed if it's over.
  2. Then hardware in order: tracking encoder, tracking cable, line tracking I/F board. Power-cycle to clear.

Quick facts

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

Related codes

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