When time-delay relays are used in time-driven sequencing, they basically take the place of ....

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Multiple Choice

When time-delay relays are used in time-driven sequencing, they basically take the place of ....

Time-driven sequencing moves from one step to the next based on a timed signal rather than a physical position being reached. A time-delay relay provides a defined pause after a step is energized, then changes state to trigger the next action. That timing role is similar to what a limit switch would signal in a position-based sequence—an event that tells the system it can advance. So, in timed sequences, the delay relay effectively substitutes for the limit switch as the trigger for progression. Pushbuttons supply manual input, proximity sensors detect presence, and interlocks control safety or interlock conditions; none of these provide the automatic timing signal that advances the sequence, which is why they don’t fit as replacements.

Time-driven sequencing moves from one step to the next based on a timed signal rather than a physical position being reached. A time-delay relay provides a defined pause after a step is energized, then changes state to trigger the next action. That timing role is similar to what a limit switch would signal in a position-based sequence—an event that tells the system it can advance. So, in timed sequences, the delay relay effectively substitutes for the limit switch as the trigger for progression. Pushbuttons supply manual input, proximity sensors detect presence, and interlocks control safety or interlock conditions; none of these provide the automatic timing signal that advances the sequence, which is why they don’t fit as replacements.

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