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← TechnologyWhich consequence results when PLC interrupt latency exceeds scan time?
A)Inaccurate quadrature encoder position updates✓
B)Reduced energy delivered to motor coils
C)Spurious activation of safety interlocks
D)Increased harmonic distortion in VFD output
💡 Explanation
Position control degrades because exceeding PLC scan time causes the missed encoder pulses via the interrupt's lost counts via process image update; therefore, the quadrature encoder position is inaccurately reported on next cycle, rather than smooth velocity as expected.
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