Answer Posted / sohail malik sngpl pakistan
there is a very important difference b/w PLC and
DCS ....Basically in a process controll system plc is
sequential bases however DCS on loop control based.
explanation if in a PLC controlled system any Intrruption
or error signal generatd the whole system which is operated
bye this PLC effected and should be stopped and give Alarm
in fact in DCS system if there is any problem generated the
system give indication such problem but switch over to the
next loop or task which may not effected.
| Is This Answer Correct ? | 11 Yes | 7 No |
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A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.
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