KUKA Robot codes
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KUKA Robot Controller

Safety · Advanced

Alarm KRC0506

KUKA Robot KRC0506 - Read protection

The KRC0506 alarm indicates that a system variable prefixed with dollar sign has been read that is not compatible with the selected KRL interpreter type. This read protection violation prevents execution of the program and must be corrected to ensure interpreter compatibility.

KUKA RobotSafetyAdvanced

KRC0506

KUKA Robot KRC0506 - Read protection

Read protection

The KRC0506 alarm indicates that a system variable prefixed with dollar sign has been read that is not compatible with the selected KRL interpreter type. This read protection violation prevents execution of the program and must be corrected to ensure interpreter compatibility.

Common Causes

  • KRC4 system variable accessed in KRC3 interpreter mode or vice versa
  • Protected system variable $CONFIG accessed without appropriate execution context
  • Legacy KRL code using KRC2 syntax variables in modern KRC4 environment
  • System variable intended for safety functions accessed in standard program context
  • Incorrect variable reference using dollar syntax in non-system variable context

Troubleshooting Steps

  1. 1Verify the selected interpreter type matches the program requirements in WorkVisual settings
  2. 2Check which system variables are available for the specific KRC version by consulting KUKA documentation
  3. 3Search the program for all dollar-prefixed variables and verify each one is valid for the interpreter
  4. 4Review KRL syntax and update deprecated system variables to current KRC4 standards
  5. 5Consult the KUKA system variable reference manual to confirm read permissions for the variable
  6. 6Modify the program to use only interpreter-compatible variables or upgrade to compatible KRC version

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