Answer / ejaz maqsood

Because the Bentlay Nevada uses the NPN Transister. thats why its suplly in negtive voltage

Answer / carl_ellis

Because negative voltage is what the Bentley Nevada circuits use.

The regional guy from Bentley Nevada was in the other day so I asked him. His answer, "Historical legacy. It's always been that."

The point is, if the circuits need a negative voltage, that's what's used.

Carl Ellis
Measure First

Answer / mohammad javed

Don Bentley uses the PNP transistor which works on negative bias voltage. That why a negative voltage is used in vibration sensors. It is the circuit design which require negative voltage.

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6 Answers   Essar,

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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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An RTD is a_________________________.it works as follows

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