Code ISD-059: Servo not ready: ext. e-stop(IPS%d)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Servo not ready: ext. e-stop(IPS%d) 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: The specified pneumatic servo is unable to reset because of an external condition such as an Emergency Stop. This external condition is forcing the digital servo ready input to stay off. Remedy: Verify that when RESET is pressed, the digital output configured as servo enable comes on briefly. Determine and rectify the external condition (e-stop, blown fuse) causing the problem and then press RESET again. Check whether the servo enable digital output turns on. Verify that the servo ready digital input and the servo enable digital output are properly set up and assigned. Increase the value of $IPS_SETUP.$SRDY_TMOUT (number of scans that the pneumatic servo system waits before checking the servo ready digital input, after RESET is pressed) if required.
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 ISD-059 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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