Okuma Alarm B-2236 – Program End Code Not Found
What Does Alarm B2236 Mean?
The Okuma alarm B2236 indicates that no valid program end code was detected at the end of the NC program block. The control expects a proper termination command but cannot find one.
As a result, the CNC system stops execution to prevent incomplete or undefined machining behavior.
Technical Explanation
In Okuma NC programming, every program must be properly terminated. This is typically done using a valid program end command such as M02 or M30.
If the program reaches the end without a proper termination instruction, the control cannot confirm that the machining sequence is complete. This triggers Alarm B2236.
In some cases, this alarm may also appear when:
-
An opening parenthesis “(” is not properly closed
-
The LAP end code (G80) is missing
-
The final program block is incomplete
-
The file was truncated during transfer
The control performs syntax validation before execution. If structural elements are missing, it blocks operation.
Typical Situations Where This Alarm Appears
Alarm B2236 commonly occurs:
-
After manual editing of the last program lines
-
When copying program sections
-
After interrupted file transfer
-
When using LAP cycles without proper G80 termination
-
When saving incomplete program versions
Possible Causes
-
Missing M02 or M30 command
-
Missing G80 in LAP programming
-
Unclosed parentheses
-
Corrupted NC file
-
Improper file encoding
Recommended Troubleshooting Steps
-
Review the last lines of the NC program.
-
Confirm that M02 or M30 is present.
-
If LAP cycles are used, ensure G80 is properly defined.
-
Check that all parentheses are closed.
-
Re-transfer the program if file corruption is suspected.
In most cases, correcting the final program block resolves the issue immediately.
Is This a Hardware Problem?
No. Alarm B2236 is typically a program structure error. It does not indicate electronic failure.
However, if similar errors occur repeatedly across different programs, storage media or control memory should be inspected.
Professional Support
If the issue persists after correcting the program structure, professional diagnostics may be required.
Our CNC electronics specialists provide:
-
Okuma control diagnostics
-
Program transfer troubleshooting
-
Storage device inspection
-
Control board repair
