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ErrorLib — Industrial Fault Code Library

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12333

Illegal ASCII string for read

Fanuc · R-30iA R-30iB Controller

What does 12333 mean?

An attempt to read an ASCII string from a file encountered invalid or malformed data that does not conform to the expected ASCII string format. This IO_STATUS error signifies data corruption or an incorrect file format when attempting string conversion. The program will abort if the file_id is invalid.

Common Causes

  • The file contains non-ASCII characters or binary data where an ASCII string is expected by the read function.
  • The string data in the file is malformed, truncated, or lacks proper terminators.
  • The file_id used does not correspond to a valid opened file.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Examine the contents of the data file using a text editor or hexadecimal viewer to verify the ASCII string format.

  2. 2

    Ensure the KAREL read operation is targeting the correct data type (e.g., STRING) for the file content.

  3. 3

    Use the KAREL command READ file_id(cr) to clear any existing IO_STATUS error condition.

Browse all codes in this manual (31)
Verified technical data. Last updated: April 2026

Related Faults

12328File is not opened12329Cannot write the variable12330Write file failed
Source: Fanuc R-30iA R-30iB Controller
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