A) 0000 0000 0000 0000 C) 0000 0000 0001 0001 D) 0000 0000 0000 0001 12 12) An examine if open' instruction works like a normally closed relay contact? A) False B) True 13) What are the operating input and output voltage levels of a PLC, and how are the /O ports 13) nit of PLC? isolated from the processor uu 120 or 24 v (answers may vary); Opto isolator 14) How is the programming scan of PLC program executed? A) top rung to bottom rung: from right to left in each rung B) top rung to bottom rung: from left to right in each rung C) bo ttom rung to top rung: from right to left in each rung D) can be in any order based on logic conditions 15) Which of the following instructions always intrepet a 1 status as true? A) XIC B) XIO C) sensor value D) none 16) Consider a PLC ladder logic program consisting of two switches (A and B that are 16) normally open) as shown in the diagram. Write a truth table for the logical conditons of the inputs and corresponding output? L1 L2 Lamp A B A B 2