Describe a simple sequencing circuit to light two indicators in order when a sensor detects an object.

Prepare for the OCC SACA Sensor Logic Systems 1 (C-205) Exam. Study with detailed questions and insightful explanations. Get ready for your certification!

Multiple Choice

Describe a simple sequencing circuit to light two indicators in order when a sensor detects an object.

When you want two indicators to light in a specific order after a sensor detects an object, you need a trigger that starts immediately and a timing element that delays the second output. The best approach uses a simple sequencing arrangement: the sensor’s detection energizes Indicator A right away, and a timer (or a cross-coupled or latch-based arrangement) holds off Indicator B until the delay has elapsed. This guarantees the first indicator lights first and the second follows in a controlled, repeatable way. Using a timer or a cross-coupled setup ensures proper interlocks: B cannot turn on until A has already lit and the timing condition is met. The sensor signal can also reset the sequence when the object is no longer present, so the next detection starts a fresh sequence. This is reliable and predictable, which is essential for automated signaling. Lighting both indicators at once would violate the required order and remove the controlled sequencing. Using a single indicator doesn’t provide the two-step indication, and having someone manually switch indicators eliminates automatic, repeatable sequencing.

When you want two indicators to light in a specific order after a sensor detects an object, you need a trigger that starts immediately and a timing element that delays the second output. The best approach uses a simple sequencing arrangement: the sensor’s detection energizes Indicator A right away, and a timer (or a cross-coupled or latch-based arrangement) holds off Indicator B until the delay has elapsed. This guarantees the first indicator lights first and the second follows in a controlled, repeatable way.

Using a timer or a cross-coupled setup ensures proper interlocks: B cannot turn on until A has already lit and the timing condition is met. The sensor signal can also reset the sequence when the object is no longer present, so the next detection starts a fresh sequence. This is reliable and predictable, which is essential for automated signaling.

Lighting both indicators at once would violate the required order and remove the controlled sequencing. Using a single indicator doesn’t provide the two-step indication, and having someone manually switch indicators eliminates automatic, repeatable sequencing.

More practice questions