Which of the following statements is correct about PLC (Programmable Logic Controllers)

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Which of the following statements is correct about PLC (Programmable Logic Controllers)

  1. The input and output instructions in ladder logic do not directly represent the switches
  2. The PLC input instructions are logical symbols associated with the voltage at the input module terminals.
  3. The PLC rung output [-( )-] is a discrete output instruction or bit in memory
  4. All of these

Correct answer: 4. All of these

Check complete list of Electrical Engineering MCQ on PLCs (Programmable Logic controllers here)

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