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ABB Error 34320 — Drive Units / topology fault

Error

ABB 34320 (“Drive Units / topology fault”): Too many drive nodes detected in the module. Likely part: Drive Units / Topologie (Drive Units / topology).

Updated 2026-10-22 · LogrobotLM reference

What it means

Too many drive nodes detected in the module.

What to check

  • Check the Drive Unit topology and the connected units; look for an extra unit or an incompatible configuration.
  • Note: Hardware topology error; particularly relevant after adding an external axis.

Part to check / replace

ABB 34320 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

34100Drive system fault34200Axis Computer / Drive Units fault34201Drive Unit fault

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 →