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Technician Certification Exam Practice

Class notes Jan 2, 2026 ★★★★☆ (4.0/5)
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Programmable Logic Controller (PLC) Technician Certification Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

  • Which component stores the user program in a PLC?
  • Input module
  • Output module
  • Memory module
  • Power supply

Answer: C

Memory modules contain program instructions and data used during PLC operation.

  • What is the primary function of a PLC scan cycle?
  • Convert analog to digital signals
  • Read inputs, execute logic, update outputs 1 / 4
  • Power the CPU
  • Store backup data

Answer: B

The PLC scan cycle sequentially processes inputs, logic, and outputs each cycle.

  • Which logic state does a normally open (NO) input represent when
  • activated?

  • Logic 0
  • Floating
  • Logic 1
  • Undefined

Answer: C

NO contacts close when energized, producing a logic high (1).

  • Ladder logic was originally modeled after what system?
  • Computer networks
  • Relay control circuits
  • Hydraulic diagrams
  • HVAC schematics

Answer: B

Ladder diagrams replicate relay-based industrial control drawings.

  • Which PLC component performs arithmetic operations? 2 / 4
  • Power supply
  • I/O chassis
  • CPU/processor
  • Terminal block

Answer: C

The CPU executes user logic and handles math, comparisons, and control functions.

  • What type of instruction is used to hold an output energized after input
  • removal?

  • Timer
  • Counter
  • Sequencer
  • Latch

Answer: D

Latch instructions maintain output states without continuous input conditions.

  • What is the purpose of a watchdog timer in a PLC?
  • Save memory
  • Monitor scan time to ensure proper CPU operation
  • Control analog outputs
  • Verify feedback loops

Answer: B

A watchdog timer resets or faults the PLC if scan time exceeds limits. 3 / 4

  • An analog input module converts signals into what form?

A. PWM

  • Relay signals
  • Digital values
  • AC voltages

Answer: C

Analog modules change continuous signals into digital data for CPU use.

  • Which of the following is a discrete PLC input?
  • 4–20 mA

B. 0–10 V

  • 24 VDC on/off signal

D. 1–5 V

Answer: C

Discrete inputs detect only two states: ON or OFF.

10. A timer that accumulates only while its input stays true is called:

A. TOF

B. RTO

C. TON

D. PTO

Answer: C

The TON instruction counts upward while input conditions remain energized.

  • / 4

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Category: Class notes
Added: Jan 2, 2026
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Programmable Logic Controller (PLC) Technician Certification Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf 1. Which component stores...

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