1. Answer the questions, in sequence, for the MCR program in Figure 9-30, assumi
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Question
1. 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. a. Switches S2 and S3 are turned on. Will outputs PLI and PL2 come on? Why? b. With switches S2 and S3 still on, switch S1 is turned on. Will output PLI or PL2 or both come c. With switches S2 and S3 still on, switch sl i turned off. Will both outputs PLI and PL2 de energize? Why? d. With all other switches off, switch S6 is turnee on. Will the timer time? Why? e. With switch S6 still on, switch S5 is turned on Will the timer time? Why? f. With switch S6 still on, switch S5 is turned off What happens to the timer? If the timer was anExplanation / Answer
MCR - Master Control Reset
The ladder Rungs between MCR forms one control circuit.
Only when the input to MCR is High then all non-retentive output work normally, if the input to MCR is low all non-retentive output will be off what ever may be rung condition of those outputs.
a)
S2 and S3 turned on but PL1 and PL2 do not turn on because S1 is not on which is input to MCR. This is because MCR reset all outputs which are non-retentive.
b)
Now given that S2 and S3 are on and along with these two switches S1 is also on . Now PL1 and PL2 will be on . Because input to MCR is high and all rungs between two MCR operates normally .
c)
Now if S1 is off, but still S2 and S3 are on PL1 and PL2 will be off.
d)
With all switches off and S6 on the timer won't time because the input to MCR is not High i.e S5.
e)
With switch S6 still on and now S5 is turned on, the timer will time now because MCR is on and the rung between MCR's will operate normally.
h)
The timer will reset when switch S6 still on and S5 off. Because MCR is off.
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