RTS Nesting

What does 19 mean?

This nesting error occurs when an RTS (Return from Subroutine) command is encountered in the CLM01.3-M program without a preceding, matching JSR (Jump to Subroutine) command. This indicates an illogical program flow, as the system attempts to return from a subroutine that was never called.

• An RTS command is executed without a corresponding JSR call, leading to an unbalanced subroutine stack.
• Program logic error causing an unconditional jump into a subroutine's return path.
• Corrupted program memory, causing the CLM01.3-M to misinterpret command sequences.
• Faulty external control sending an erroneous program sequence to the CLM01.3-M.

Click steps to track your progress.

1. 1

   Review the CLM01.3-M user program to ensure that every RTS command is preceded by a corresponding JSR command within the logical program flow.

2. 2

   Debug the program logic for any unintended jumps or branches that might bypass a JSR call but still lead to an RTS command.

3. 3

   Verify program sequencing to ensure that subroutine calls (JSR) and returns (RTS) are properly matched and ordered.

4. 4

   If the program appears correct, check for potential memory corruption by re-transmitting the user program to the CLM01.3-M.

5. 5

   If external programming tools are used, ensure they generate correct and balanced JSR/RTS sequences.