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ABB Error 38204 — Serial Measurement Board (SMB) fault

Error

ABB 38204 (“Serial Measurement Board (SMB) fault”): SMB Y signal offset error. Likely part: SMB (Serial Measurement Board (SMB)) +1 more.

Updated 2026-10-22 · LogrobotLM reference

What it means

SMB Y signal offset error.

What to check

  • Check the SMB and its wiring; if the error persists, replace the Serial Measurement Board.
  • Note: Internal analog fault in the measurement chain.

Part to check / replace

ABB 38204 points to the hardware below — start here before ordering.

Tap a part for every code that points to it — and verify the exact variant for your controller before ordering.

Related codes

20032Revolution counter not updated20033Axis not synchronized38034Axis Computer / SMB / Serial measurement cable fault

Same hardware involved

38203SMB38205SMB38206SMB38207SMB

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 →