Use Figure 7 to answer questions 7-9. For the counter program shown in Figure7,

Question

Use Figure 7 to answer questions 7-9. For the counter program shown in Figure7, the counter increments by one for each false- to-true transition of: A. rung No.1. B. rung No. 2. C. rung No. 3. D. rung No.4. A preset count of 50 is selected when input _____is closed. A. LS 1 B. A C. B D C For the light to come on after an accumulated count of 175: A. rung No. 3 must be true. B. rungs No. 2, No. 3, and No. 4 must be true. C. rungs No. 1, No. 2, and No. 6 must be true. D. rungs No. 1, No. 2, No. 4, and No. 6 must be true.

Explanation / Answer

7)

The counter up will start counting when the input to the counter is low to high i.e switch on.

In the above ladder logic, rung1 has input push button LB1 which when pressed CTU will be energized and increment the count by 1.

option :- A

8)

MOV instruction moves data to the destination when the input is High. To move 50 to accumulate of CTU rung 4 should be high i.e C should be pressed.

option : -D

c)

The light will come on when input c6 DN bit is 1 i.e High, for this to happen accumulator of the counter should have a value of 175. This is possible when mov instruction is high which has data of 175. For this rung 3 should be on.

option :- A

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