OCC SACA Sensor Logic Systems 1 (C-205) Practice Test

Question 1

What is the recommended practice to verify controller expectations after swapping a sensor module?

Never test the controller after swapping Verify controller expectations by testing the input behavior under expected conditions and confirm the controller reads the change correctly Assume compatibility without testing Only update firmware

Correct Answer:

Verify controller expectations by testing the input behavior under expected conditions and confirm the controller reads the change correctly

Explanation:

When a sensor module is swapped, you need to revalidate what the controller expects by testing how the new sensor behaves under normal conditions and confirming that the controller reads the change correctly. This end-to-end check makes sure the controller sees the new sensor’s signal within the expected range, uses the right scaling, and responds as intended. It also helps catch mismatches in wiring, sensor type, or timing that could cause incorrect control actions. Skipping testing or assuming compatibility can hide real issues, and updating firmware alone doesn’t verify that the controller correctly interprets the new sensor input. The safest and most effective practice is to actively test the input behavior and verify the controller’s readings and responses match what is expected with the new module.

Question 2

How inversion is created in sensor logic using normally closed contact?

Place a normally closed contact in series with the coil; the coil energizes when the input is absent. Place a normally closed contact in series with the coil; the coil energizes when the input is present. Place a normally closed contact in parallel with the coil; coil energizes regardless. Use a normally open contact to achieve inversion.

Correct Answer:

Place a normally closed contact in series with the coil; the coil energizes when the input is absent.

Explanation:

Inversion in sensor logic means the output state is the opposite of the input condition. Using a normally closed contact in series with the coil does this: when the input is absent, the NC contact is closed and current can flow to energize the coil. When the input is present, the NC contact opens, cutting the current and de-energizing the coil. So the coil is ON when the input is OFF, and OFF when the input is ON, exactly the inverted behavior you want. Using a normally open contact in series would energize the coil only when the input is present (non-inverted). A normally closed contact in parallel could bypass the coil and yield unreliable results.

Question 3

A capacitive proximity sensor uses the principle of what to sense objects?

Inductance Resistance Capacitance Reflectivity

Correct Answer:

Capacitance

Explanation:

Capacitive proximity sensors rely on changes in capacitance caused by the nearby object altering the electric field around the sensing electrode. The electrode and the object form a capacitor, and as the object approaches, the effective dielectric between the plates increases, raising the capacitance. The sensor’s electronics detect this change (often by a shift in oscillation frequency or charging time) and signal when the object is close enough. This non-contact method is distinct from inductive sensing, which uses magnetic fields to detect metal objects, resistance-based sensing that needs a current path, or reflectivity-based sensing that relies on light.

Question 4

Distinguish between analog sensor signals and digital (discrete) sensor signals and how logic handles them.

Analog signals are binary; digital signals vary continuously. Analog signals vary continuously and may require conditioning or ADCs; digital signals are on/off and map directly to logic inputs after conditioning. Both analog and digital signals require no conditioning for PLC inputs. Digital signals cannot be read by logic.

Correct Answer:

Analog signals vary continuously and may require conditioning or ADCs; digital signals are on/off and map directly to logic inputs after conditioning.

Explanation:

Analog signals come from sensors that vary smoothly over a range, so they can take an infinite number of values. To be read by logic, you usually condition them and convert the value to digital with an analog-to-digital converter (or use an analog input module that samples the signal). Digital (discrete) signals are two-state, on or off, and after conditioning to meet the logic voltage levels, they map directly to logic inputs and are read as distinct high or low states. This is why the best description says analog signals vary continuously and may require conditioning or ADCs, while digital signals are on/off and map to logic inputs after conditioning. The other statements mischaracterize analog as binary, claim digital can’t be read by logic, or deny the need for conditioning in PLC inputs.

Question 5

Why are relay contacts normally used to perform control logic?

Relay contacts can turn some outputs on and others off at the same time They are faster than microcontrollers They require no maintenance They produce less heat

Correct Answer:

Relay contacts can turn some outputs on and others off at the same time

Explanation:

Using a single relay coil to operate multiple contacts lets one control action change several circuits at once. The contacts can be wired so that some close (turn outputs on) while others open (turn outputs off) when the coil is energized, giving coordinated, multi-output control from one control signal. This ability to implement simple logic by arranging normally open and normally closed contacts in various paths makes relays ideal for control logic in many systems. They also provide isolation between the control and the load, but the key benefit is the capacity to drive multiple outputs simultaneously with one action.

Question 1

Exam overview

About this Exam

Prepare with the OCC SACA Sensor Logic Systems 1 (C-205) Practice Test practice quiz. This question bank includes 10 questions covering sensor, logic, normally, closed, and signals. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

More details

Additional Information

OCC SACA Sensor Logic Systems 1 (C-205) Practice Test

This practice set contains 10 questions from the matching question bank and focuses on sensor, logic, normally, closed, and signals. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

Quiz information

Frequently Asked Questions

The complete question count is available after full access is unlocked.

No fixed duration is currently configured for this quiz.

Question explanations are included where they are available in the quiz content, helping you review the reasoning after answering.

Yes. You can retake the practice test again as you continue studying during your available access period.

After your access is confirmed, you can continue into the complete practice exam from this quiz flow.

Unless explicitly stated otherwise, this page provides independent practice material for study and exam preparation and is not the official examination itself.

Keep studying

Correct Answer:

Explanation:

Correct Answer:

Explanation:

Correct Answer:

Explanation:

Correct Answer:

Explanation:

Correct Answer:

Explanation:

About this Exam

Additional Information

OCC SACA Sensor Logic Systems 1 (C-205) Practice Test

Frequently Asked Questions

Related Questions

2W151B Munitions Systems Journeyman Volume 2 Practice Exam

Arizona Low Voltage Communication Systems (ACJIS) Practice Exam

Arizona DECA Low Voltage Communication Systems Practice Exam

Certified Specialist in Gerontological Nutrition Practice Exam

ASU CEE181 Sustainable Systems Practice Exam

Certified Professional in Healthcare Information and Management Systems (CPHIMS) Practice Exam