How does a timer work in sensor logic and give an example?

• A. A timer increases the voltage indefinitely
• B. A timer delays or keeps an output active for a set period after an input event; example: hold a motor on for a fixed time after a part is detected
• C. A timer stores log files
• D. A timer filters out noise

Answer: (B)

Timers provide time-based control in sensor logic. They start counting when an input event occurs and can either delay turning the output on, or keep the output active for a defined period after the event. This lets you create predictable, repeatable actions—for example, holding a motor on for a fixed time after a part is detected so the part is processed completely even if the sensor signal changes right away. The other options don’t describe this time-based control: a timer doesn’t simply increase voltage indefinitely, it isn’t used for storing log files, and while timers can be involved in debouncing, their primary role isn’t filtering noise.