LogrobotLM

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FANUC Alarm VISN-138 — WARN 3DGP Failed to open Port …

Manufacturer wording — WARN 3DGP Failed to open Port %s
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC VISN-138 (“WARN 3DGP Failed to open Port …”): The vision system failed to initialize a communication port. First check: If posted with VISN-137, use the for VISN-137.

Updated 2026-09-17 · LogrobotLM reference

Description

The vision system failed to initialize a communication port. May be posted with VISN-137.

Remedy

If posted with VISN-137, use the for VISN-137. Otherwise, check the vision communication cables and connections.

Related codes

VISN-136WARN 3DGP Vision Offset Retry AttemptVISN-137WARN 3DGP Configure Port … to No UseVISN-139WARN 3DGP …VISN-140WARN 3DGP Run Without Offsets

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 →