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FANUC Alarm PRIO-104 — STOP Device is off-line

Error
Hardware
I/O Link and process I/O
Controllers
R-J3iB / R-30iA
FANUC class
PAUSE.G
Hardware family
FANUC I/O Link, process I/O board, fuse and output alarms

FANUC PRIO-104 (“STOP Device is off-line”): An attempt has been made to access to a port assigned to a device or board which is offline. First check: For DeviceNet ports, troubleshoot as follows: Check the status of the DeviceNet board using the Digital I/O DeviceNet screen.

Updated 2026-10-22 · LogrobotLM reference

Description

An attempt has been made to access to a port assigned to a device or board which is offline. This might be the result of an error or device having been set offline manually.

Remedy

For DeviceNet ports, troubleshoot as follows: Check the status of the DeviceNet board using the Digital I/O DeviceNet screen. If the status field for the board is OFF, set it ONLINE. If the status is ERROR, check the following: 1.) The daughter board is installed on the Interface board. 2.) There is power on the network. If these do not indicate a problem, set the board ONLINE. If the board is ONLINE, check the DEV LST screen entry for the indicated device. If the status field for the device is OFF, set it ONLINE. If the status is ERROR, check the following: 1. The device is physically present on the network. 2. The baud rate is set correctly. 3. There are not devices with duplicate MAC-Id's on the network. 4. The device with the required MAC-Id is the device type indicated in the DEV LST screen.

Field diagnosis

Access to a port assigned to a board or device that is offline: following an error or a manual offline setting.

What to check

  • For DeviceNet, check the board status on the DeviceNet screen: OFF, bring it back online; ERROR, check the daughter board and the network power supply before bringing it back online.
  • Then check the status of each device.
  • Note: A DeviceNet network without a dedicated 24 V supply stays in error no matter what you do.

Related codes

PRIO-020STOP I/O Link comm error …, …, …, … (hex)PRIO-100STOP Model B comm fault …rack:… slot:…PRIO-102WARN Cycle power to restart PLC I/OPRIO-106STOP Device with port is off-linePRIO-119WARN Too many DIGITAL I/O ports

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 →