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Michelin Internal ControlLogix Practice Test

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Which example is listed for a token-passing network?
Correct Answer:
DH+
Explanation:
Token-passing control gives each device on the network the right to transmit only when it holds a circulating token. This creates deterministic access and avoids collisions, which is valuable in industrial control networks. Data Highway Plus (DH+) fits this idea because it uses a token-passing access method on its serial fieldbus, coordinating which device can talk next. Ethernet operates differently, using shared-medium access (classic CSMA/CD) or switch-based methods. CAN uses bus arbitration by message priority rather than a circulating token, and Profibus relies on master-slave polling rather than token-passing. Therefore, the example that demonstrates a token-passing network among these options is Data Highway Plus.

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