Okuma Alarm B-2944 – Comment End Code Not Found
What Does Alarm B2944 Mean?
The Okuma alarm B2944 indicates that a comment end character is missing in the NC program. The control detected an opening parenthesis “(” but could not find the corresponding closing parenthesis “)”.
Because of this syntax error, the CNC control cannot correctly interpret the program structure and stops execution to prevent incorrect machining.
Technical Explanation
In Okuma NC programming, comments are written inside parentheses. Every opening parenthesis must be properly closed.
If a comment is started but not closed, the control continues searching for the matching closing symbol. When it cannot find one, Alarm B2944 is triggered.
This alarm is not a hardware fault. It is a program structure validation error designed to protect the machine from executing incomplete or misinterpreted code.
Typical Situations Where This Alarm Appears
Alarm B2944 commonly occurs:
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After manual editing of NC programs
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When copying and pasting program sections
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After interrupted DNC transmission
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If the program file becomes corrupted
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When special characters are inserted accidentally
Possible Causes
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Missing closing parenthesis
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Incomplete comment section
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Corrupted NC file
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Encoding errors during file transfer
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Unexpected characters in the program
Recommended Troubleshooting Steps
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Open the program and review the line indicated by the alarm.
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Check for unmatched opening parentheses.
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Ensure every “(” has a corresponding “)”.
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If necessary, re-transfer the program from a verified source.
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Verify that the file was not damaged during transfer.
In most cases, correcting the syntax resolves the issue immediately.
Is This a Serious Error?
No. Alarm B2944 does not indicate hardware damage. It is a protective control mechanism that prevents incorrect program execution.
However, if similar errors appear frequently across multiple programs, it may indicate issues with storage media or data transmission.
Professional Support
If program corruption occurs repeatedly or additional control errors are present, professional diagnostics may be required.
Our CNC electronics specialists provide:
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Okuma control diagnostics
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Program transfer troubleshooting
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Storage device inspection and replacement
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Control board repair
