Answer Posted / bhagsen parvat
1.No signal loss in current transmission.
2.AS per ANSI std. (4 to 20mA) signal used which is
intrinsically safe signal in hazardous area.
3.inherent insensitivity to electrical noise.
4.All the components in the loop drop voltage due to the
signaling current flowing through them. The signaling
current is not affected by these voltage drops as long as
the power supply voltage is greater than the sum of the
voltage drops around the loop at maximum signaling current
of 20mA.
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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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