What the RC alarm means

A Robot System Configuration (RSC) fault — the calibration/setup data the servo relies on is invalid or missing. This fault appears in a large share of our Omron SmartController (ACE / Viper / Cobra) service tickets, and the first round of on-site checks usually finds the source.

Most common causes

  • Encoder battery failure corrupting calibration
  • SD card or setup file corruption
  • RSC utility run incorrectly
  • Controller restore without matching robot data
Field note: Most of the time the problem is the first item on the list, so ruling it out saves you half the time.

Step-by-step field fix

  1. Back up the current setup files before touching anything
  2. Run the RSC service utility (RSC_SET) per the service documentation to clear/reset the fault
  3. Re-calibrate joints against mechanical references
  4. Verify the SD card health and setup file integrity
  5. Involve the OEM service office if calibration cannot be restored
Safety first: For OMRON rc, the risk on this family is not injury but data: lose the program, parameters and calibration data and weeks of teaching work start over. What you can check yourself first is Back up the current setup files before touching anything; program and calibration data handling is not a DIY job.

How we diagnose system alarms on site

OMRON rc belongs to the system & program family. On OMRON rc the failing stage is OMRON robot software environment (OMRON robot controllers (including SCARA and cobot companions)) on the OMRON robot controllers (including SCARA and cobot companions) - the software layer: corrupted program or parameter files, boot failures, version mismatch, memory and storage media. We start reading OMRON rc at controller status indicators and the software error list (letter prefixes RC / SW / V / M / D / A / E).

The chain involved in OMRON rc runs: storage media (CF / flash / disk) -> system software and firmware -> parameters and calibration data -> user programs -> runtime.

Encoder battery failure corrupting calibration on OMRON rc often traces to a version combination: A solid share of system alarms comes from mismatched version sets: controller firmware upgraded while pendant software, drive configuration or a vision option stayed behind, so boot-time validation fails. Another flavour is a swapped main board or storage media whose system image carries hardware configuration that no longer matches reality. We line up firmware version, software version, option list and actual hardware config and find the one that disagrees. No hardware needed - but the matching recovery media is.

Field notes on this page cover OMRON rc (RSC Fault (Robot Setup / Calibration Data)); written by the Henghuan repair team, updated 2026-10-01.

Stalled on the diagnosis? Let an engineer help remotely

Send the alarm code, the robot model and a description of what was happening at the alarm. Our engineers handle OMRON rc OMRON rc every day, and remote diagnosis by phone/video is free.

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Related System & Program alarms

SW — Software Watchdog Timeout
Same family: this code belongs to the System & program alarms family - the page collects all System & program-family codes we have handled, with the common inspection order and spares.
Other brands: we also keep field-fix libraries for ESTUN · INOVANCE · EFORT and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the OMRON rc alarm mean?

A Robot System Configuration (RSC) fault — the calibration/setup data the servo relies on is invalid or missing. This fault appears in a large share of our Omron SmartController (ACE / Viper / Cobra) service tickets, and the first round of on-site checks usually finds the source. OMRON rc sits in the system & program family; on our work orders the highest-frequency trigger for this code is "Encoder battery failure corrupting calibration".

QCan I clear a OMRON rc alarm myself?

Whether OMRON rc clears on its own depends on the outcome of "Back up the current setup files before touching anything". Finish the flow with "Involve the OEM service office if calibration cannot be restored" to confirm OMRON rc - do not skip it. If that step is clean, the second most frequent cause on OMRON rc is "SD card or setup file corruption". Do not chase takt through a repeating OMRON rc. Left alone, system & program faults tend to graduate from repairable to must-replace.

QWhen you handle OMRON rc, will my programs and frames get lost?

The commonest causes we see on OMRON rc are "Encoder battery failure corrupting calibration, SD card or setup file corruption, RSC utility run incorrectly", so we stock the van against those. For OMRON rc specifically, we carry recovery media and common storage media, but on this family the backup matters more than the spare. For OMRON rc, on system alarms the first move is backup; we can walk the customer through preserving data remotely before anything else. Before we roll, tell us what OMRON rc shows on controller status indicators and the software error list (letter prefixes RC / SW / V / M / D / A / E) and what the machine was doing - phone or video triage is free.

This page on OMRON rc is based on the field experience of the Henghuan Robotics repair team. Alarm explanations are our own summary for troubleshooting reference and may differ across controller and software versions — if unsure, verify against Omron documentation or reach out to us. Henghuan is an independent service provider with no affiliation or endorsement by Omron.