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Which 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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