Code PRIO-104: Device is off-line
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Device is off-line alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Cause: 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.
Source: FANUC Robot R-30iA Alarm Code List Operator's Manual
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Fanuc R-30i Series Robot Controller Alarms
Fanuc controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code PRIO-104 on the R-30i Series Robot Controller identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Fanuc's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 6553 Fanuc R-30i Series Robot Controller codes.
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