Practice question

What is the purpose of the 'dual entry' feature in a dual-ring controller?

To allow two technicians to program the controller simultaneously
To allow both rings to start phases on the same side of the barrier simultaneously at the beginning of a cycle
To enable two preemption sequences to run concurrently
To provide redundant controller operation for safety

Answer: B — To allow both rings to start phases on the same side of the barrier simultaneously at the beginning of a cycle

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