Discussion
A drive's communication interface to a plant controller commonly uses
Answer: D
Correct answer: an industrial fieldbus or Ethernet protocol
Modern drives are integrated into plant control through a digital protocol - Profibus, Modbus, EtherCAT, Profinet and the like - which carries speed and torque references, status and diagnostics on one connection. It replaces the analogue reference and relay contacts of older installations and allows far more information to pass.
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