14. Which of the following statements is correct?Ī) Ladder logic is a PLC graphical programming technique introduced in the last 10 years.ī) A ladder logic program is hard to analyze because it is totally different when compared with the equivalent relay logic solution.Ĭ) The number of ladder logic virtual relays and input and output instructions is limited only by memory size.ĭ) The number of contacts for a mechanical relay is limited to number of coils on the relay. D) PLC input instructions are logical symbols associated with voltage at the input module terminals.
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