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ABB Error 71367 — No communication with I/O unit

Error

ABB 71367 (“No communication with I/O unit”): No communication with I/O unit: no communication could be established with the I/O unit at start-up. Likely part: Unité d'E/S DeviceNet / Alimentation 24 V (Unité d'E/S DeviceNet / Alimentation 24 V).

Updated 2026-10-22 · LogrobotLM reference

What it means

No communication with I/O unit: no communication could be established with the I/O unit at start-up. Often accompanied by 71424 (bus off).

What to check

  • Check the DeviceNet power supply: 24 VDC, pin 1 = 0 V, pin 5 = +24 V.
  • Check the termination resistors (121 ohms between pins 2 and 4): without termination, the bus does not start.
  • Check cables, connectors and network length/topology.
  • Replace the faulty I/O unit.
  • Adjust the Unit Trustlevel (0-3) if the unit may legitimately be absent.
  • Note: Complements 71301 (DeviceNet bus communication fault), already listed. Former equivalent: "512 ERREUR CARTE D'E/S" (S2/S3).

Part to check / replace

ABB 71367 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

41555I/O unit / Bus cable / Process equipment fault71058I/O unit communication lost7129924 V DeviceNet power supply 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 →