ILLEGAL EXECUTION SEQUENCE

What does DS0009 mean?

This Fanuc Series 0i-D/0i Mate-D malfunction prevention alarm indicates that the control detected an illegal execution sequence. This implies a logic error in the program or an unexpected state transition.

• Logic error in the NC program or PMC ladder logic leading to an invalid command sequence.
• Incorrect macro program execution or unexpected M-code/T-code call.
• Corrupted NC program data or PMC program causing irregular flow.
• Unexpected machine state transition during program execution.

Click steps to track your progress.

1. 1

   Review the NC program and PMC ladder logic for any sequences that could lead to an invalid or unexpected command execution.

2. 2

   Check for any conditional logic (e.g., IF statements, GOTO commands) that might lead to an unintended program flow.

3. 3

   Verify the machine's current operational mode and state transitions (e.g., manual to auto, program restart) for any irregularities.

4. 4

   Examine any recently modified programs or macros for logical errors or unsupported commands.

5. 5

   Perform a step-by-step execution of the program in single-block mode to pinpoint the exact point of the illegal sequence.