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In automated robotic welding, which consequence results when PLC cycle time exceeds encoder feedback rate?

A)Arc instability in the weld
B)Robot loses positional accuracy
C)Overheated servo motor windings
D)Inverter trips due to overcurrent

💡 Explanation

Positional accuracy degrades because the PLC's decision-making lags behind the actual joint positions reported via the encoder; this involves the *control loop delay* mechanism. Therefore, the robot becomes inaccurate rather than problems with welding parameters arising from arc instability.

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