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Which outcome occurs when a PLC controlling a robotic arm gripper exceeds its scan cycle time, particularly with high-resolution encoder feedback?

A)Gripper positional accuracy degrades significantly.
B)Encoder signal strength abruptly amplifies.
C)Motor torque automatically decreases slightly.
D)Internal PLC temperature marginally lowers.

💡 Explanation

Gripper accuracy decreases because the PLC's PID control loop utilizes encoder feedback; exceeding scan cycle time causes missed encoder counts and delayed adjustments, using dithering rather than closed-loop control. Therefore positional error is more likely, rather than other parameters shifting.

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