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These 10 free FESTO-L2-PID questions are organized by exam domain, so you can see how each part of the Level 2: Advanced Mechatronics Applied Product ID Fundamentals blueprint is tested. Reveal the answer and explanation under each question.
An authorized technician must work beneath a raised pneumatic stopper to replace an RFID bracket. The assembly must remain raised for access, and its approved mechanical support can be engaged from outside the guard. Electrical and air supplies are locked out, but 6 bar remains trapped in the cylinder circuit. What must be done before entry?
Correct answer: C - Engage the approved support, vent trapped air, and verify the energy controls.
A serial-link trace shows that product-code data 1010011 were sent with parity bit 0 and received as 1000010 with parity bit 0. The receiver uses even parity and reports no error. Which conclusion is supported?
Correct answer: D - Two changed data bits can pass either even or odd parity.
An intact GS1 DataMatrix gives the correct GTIN, but the host reports lot 'LOT84221SN675' and no serial number. The intended lot under AI (10) is LOT842; serial SN675 follows it under AI (21). Inspection finds no encoded separator between these fields. Which change restores GS1-compliant field separation while keeping the lot before the serial?
Correct answer: A - Insert FNC1 after the lot and before AI (21).
Two identical replacement drives from the same production lot return for service on different dates. Their GS1-128 labels scan correctly, but a database keyed by GTIN and lot merges their histories. Serial numbers are unique within each GTIN, and drives can move between reusable carriers. Which key will keep each drive's history together through manufacture, return, and rework?
Correct answer: C - GTIN plus the drive's serial number
The traceability service treats carrier IDs '0042' and '42' as different, valid identifiers. A reader sends the ASCII bytes 30 30 34 32 in hexadecimal. A capture at the receiving port shows those same four bytes, yet the application submits '42'. Where does the correction belong?
Correct answer: D - Preserve the identifier as text throughout the receiving application.
An RFID gate sometimes returns carrier ID C52 together with an unexpected ID, R19. Clearing its result buffer does not remove the fault. During a test with the conveyor empty, R19 appears when a tagged spare carrier is parked beside the gate and disappears when that carrier is removed. These observations point to:
Correct answer: A - A read zone that includes the parked spare carrier.
An RFID transaction starts when a carrier enters a validated read zone 160 mm long. Its complete in-zone sequence is inventory, 25 ms; write, 90 ms; read-back, 65 ms; and PLC transfer and decision, 30 ms. These are sequential worst-case times, and at least 40 ms must remain unused. A 100 ms cloud upload occurs after release and does not delay it. What is the fastest listed constant conveyor speed that meets the requirement?
Correct answer: B - 600 mm/s
On polished curved housings, a ring light creates a bright patch that moves across a black printed code as each housing rotates slightly. The code reads correctly outside the patch; reducing exposure darkens the remaining characters without eliminating the reflection. Camera and housing positions are fixed. Which illumination is the best candidate for a controlled trial?
Correct answer: B - Diffuse dome illumination around the camera's view of the surface
A vision station assigns a defect score from 0 to 1; higher scores indicate stronger evidence of a defect. Parts at or above the selected threshold are rejected. The specification requires measured detection of at least 97% of defective parts and rejection of no more than 2% of good parts. Each setting was tested on the same independently classified parts. Which setting meets both requirements?
Correct answer: C - Threshold 0.75: 98.0% of defective parts detected; 1.2% of good parts rejected.
With result buffering enabled, a barcode reader holds ResultsAvailable high until the PLC acknowledges the result. The PLC copies data on that signal's rising edge. The first carrier is processed correctly; later triggers are acknowledged and decodes are logged, but no more results reach the PLC logic. A trace shows ResultsAvailable continuously high and ResultsAck continuously low. What change completes the PLC's result-transfer sequence?
Correct answer: B - Set ResultsAck after copying each result; clear it after ResultsAvailable falls.
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