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what is diffrence between analog card and digital card in
plc.how analog card work,Please explain in detail.Please
send it on abhi_vyas@sify.com
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Answer Posted / suraj sharma , krishan chand
analog card is that where we have to measure the temperature
of RTD and Thermocouple, where as digital card is used as
that check the condition of the motor is in on condition or
off condition, in analog card we have two voltages like
(0-10v) and (4-20mA) and in this card we have a switch
setting for the reason that we want o/p in mA or V in many
case, in the case of analog card we have a single i/o card
with it self but in case of digital card we have a i/o card
is separate, analog card is a measuring value device but in
case of digital card its o/p is either 0 or 1, and digital
card o/p is turned on due to relays.
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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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