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Issue: Incorrect “X-Ray On” Indicator When Safety Interlock is Active

An issue was observed where the system showed the “X-Ray On” indicator as active even when the safety interlock was open. Although the X-ray generation was correctly blocked for safety, the indicator on the display did not reflect the actual safe condition, which could confuse the operator.

Issue: Incorrect “X-Ray On” Indicator When Safety Interlock is Active

System

Xonar X-Ray Imaging System

Overview

An issue was observed where the system showed the “X-Ray On” indicator as active even when the safety interlock was open.

Although the X-ray generation was correctly blocked for safety, the indicator on the display did not reflect the actual safe condition, which could confuse the operator.

Expected Behavior

When the safety interlock is active/open:

    • X-ray generation must be disabled
    • “X-Ray On” indicator must remain OFF
    • System should display a safe condition

Actual Behavior

    • Safety interlock activated correctly
    • X-ray output was blocked correctly
    • However, the “X-Ray On” indicator stayed ON incorrectly

Root Cause

The issue was caused by a firmware logic mismatch.

The indicator was linked to the X-ray request signal instead of the final X-ray enable signal after safety interlock verification.

As a result:

    • The system requested X-ray operation
    • Safety interlock blocked actual X-ray generation
    • But the indicator still showed “ON”

Why This Happened

The following gaps were identified:

    • Indicator logic did not check safety interlock status
    • Display logic was not synchronized with final enable output
    • No validation layer existed for safety-critical indicators

Impact

Safety Impact

    • No unsafe X-ray emission occurred
    • Safety interlock function worked correctly

Operational Impact

    • Incorrect status indication could confuse operators

Compliance Impact

    • Safety status display did not accurately represent system state

Fix Implemented

The firmware was updated with the following improvements:

    • “X-Ray On” indicator now follows the final X-ray enable output
    • Added interlock dependency check in indicator logic
    • Improved synchronization between safety logic and UI display
    • Verified operation through repeated interlock testing

Validation Results

Test Condition

Expected Result

Status

Interlock Open

Indicator OFF

Pass

Interlock Closed

X-Ray allowed

Pass

Multiple Toggle Cycles

Stable operation

Pass

Preventive Actions

To avoid similar issues in future releases:

    • Added validation for all safety-related indicators
    • Added dedicated interlock test cases
    • Improved firmware regression testing
    • Included UI verification in safety validation process

Conclusion

The issue was caused by incorrect firmware mapping of the “X-Ray On” indicator.

The updated logic now ensures that the indicator reflects the actual X-ray enable status after all safety conditions are verified, providing accurate and reliable system feedback to the operator.