Answer the questions, in sequence, for the MCR program in Figure 9-30 , assuming

Question

Answer the questions, in sequence, for the MCR program in Figure 9-30 , assuming the program has just been entered and the PLC is placed in the RUN mode with all switches turned off.

Switches S2 and S3 are turned on. Will outputs PL1 and PL2 come on? Why?

With switches S2 and S3 still on, switch S1 is turned on. Will output PL1 or PL2 or both come on? Why?

With switches S2 and S3 still on, switch S1 is turned off. Will both outputs PL1 and PL2 deenergize? Why?

With all other switches off, switch S6 is turned on. Will the timer time? Why?

With switch S6 still on, switch S5 is turned on. Will the timer time? Why?

With switch S6 still on, switch S5 is turned off. What happens to the timer? If the timer was an RTO type instead of a TON, what would happen to the accumulated value?

Explanation / Answer

1) Yes PL1 and PL2 will on, S2 and S3 are normal open switches when they turned on out put of these legs receive supply. since output of these legs are PL1 and PL2.

2) As long as S2 and S3 are on PL1 and PL2 are in on position. They are arranged to come into on when S2 and S3 are switched on.

3) No, PL1 and PL2 are in on even switch S1 is off.

4) with switch S6 on timer will on and enable signal will be send after reaching time delay.

5) No affect to timer if S5 is on.

6) Timer depends on S6 only. If timer is RTO type, then reset time will activated. accumalated value is reset value.

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