FANUC Alarm OPTN-020 — Too many … references
Manufacturer wording — Too many %s references
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC OPTN-020 (“Too many … references”): The maximum number of feature references in the.fd files is exceeded. First check: If the alarm includes: Increase KAREL constant: CONFIG CLIMIT REQUIRE DLIMIT OPTION OLIMIT Robot REQUIRE RLIMIT STANDARD SLIMIT
Updated 2026-09-17 · LogrobotLM reference
Description
The maximum number of feature references in the.fd files is exceeded. These include: REQUIRE, INCLUDE,
Remedy
If the alarm includes: Increase KAREL constant: CONFIG CLIMIT REQUIRE DLIMIT OPTION OLIMIT Robot REQUIRE RLIMIT STANDARD SLIMIT
Related codes
Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →