KUKA Robot codes
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KUKA Robot Controller

System · Basic

Alarm KRC0169

KUKA Robot KRC0169 - USERMEMORY DELETED (**)

This alarm indicates that the user memory (USERMEMORY) in the KUKA KRC controller has been deleted or cleared, typically during a controller restart, memory initialization, or system reset. The alarm signifies that custom programs, variables, or user-defined data that were stored in volatile user memory are no longer available. This can result in loss of runtime data, program variables, or temporary storage contents depending on what was stored in that memory segment.

KUKA RobotSystemBasic

KRC0169

KUKA Robot KRC0169 - USERMEMORY DELETED (**)

USERMEMORY DELETED (**)

This alarm indicates that the user memory (USERMEMORY) in the KUKA KRC controller has been deleted or cleared, typically during a controller restart, memory initialization, or system reset. The alarm signifies that custom programs, variables, or user-defined data that were stored in volatile user memory are no longer available. This can result in loss of runtime data, program variables, or temporary storage contents depending on what was stored in that memory segment.

Common Causes

  • Unexpected power loss or emergency stop (E-STOP) during operation causing volatile memory loss
  • Controller restart or reboot cycle clearing temporary user memory buffers
  • Memory initialization procedure executed through teach pendant or system diagnostics
  • Firmware update or system reset operation that clears user memory space
  • Hardware malfunction in RAM or memory module causing data corruption and automatic clearing

Troubleshooting Steps

  1. 1Acknowledge the alarm on the teach pendant and note the exact time and circumstances when the alarm occurred
  2. 2Check the controller backup logs and system event history to determine the cause of memory deletion (power cycle, reset command, or firmware update)
  3. 3Verify that all critical program files are saved and accessible on the controller's persistent storage or external backup
  4. 4Reload any necessary user programs, variables, or calibration data from backup files into the controller memory
  5. 5Perform a controlled restart of the KRC controller to reinitialize memory structures and verify normal operation
  6. 6If alarms persist after reloading data, contact KUKA service support to diagnose potential hardware memory issues or perform a complete system diagnostics test

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