ABB Error 90804 — Communication lost with Safety Controller

ABB 90804 (“Communication lost with Safety Controller”): “Communication lost with Safety Controller” is an ABB IRC5 event of major severity.

Updated 2026-10-23 · LogrobotLM reference

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 →