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Automation Technology > Test Two > Flashcards

Test Two Flashcards

1
Q

What is open loop control?

A

Cheaper to install
Usually no feedback signal
Typically requires an operator
Usually not automatic

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2
Q

What is closed loop control?

A

Will have feedback signal
Can be automatic
Has measurement devices or sensors
Can run 24/7
Has a PLC or some type of controller

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3
Q

What is process control?

A

The set point remain unchanged
Objective of the system is to maintain set-point at all times
Example is batch process- making cookies

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4
Q

What is motion control?

A

Also referred to as servo control
Uses PID block
setpoint changes frequently

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5
Q

What are function blocks?

A

Programing blocks that will perform a predetermined function

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6
Q

What does the equal function block do?

A

Source A is equal to source B. The block will go high for one scan

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7
Q

What does the greater function block do?

A

When source A is greater than source B it will send a high signal for one scan

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8
Q

What does the less than function block do?

A

When source A is less than source B it will send a high signal for multiple scans

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9
Q

What is Level Control?

A

The height at which a container is filled with a material

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10
Q

What is point to point level control?

A

Typically have two sensors. One at the low point and one at the high point

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11
Q

What is continuous level control?

A

Always monitoring one set point at all times

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12
Q

What should one considered when selecting a measurement device?

A

What is the material being measured?
What is the cost of the sensor?
How accurate does it have to be?

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13
Q

What are direct level measurement types?

A

A float or sight glass
Typically mechanical

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14
Q

What is a mechanical measurement device?

A

A paddle wheel or other types of displacement methods

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15
Q

What are electronic or indirect measurement devices?

A

Conductive probes
Radar level detector
D.P Cell
All sensors with a transmitter or transducer

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16
Q

What are power sources in level control?

A

A pump or auger to move material
Static pressure tank

17
Q

What are transfer systems in level control?

A

Pipes and conveyors

18
Q

What was used in the lab to create this automatic on/off level controller?

A

Two function blocks. One less than and one greater than. Feedback signal from the D.P cell

19
Q

What sensor is used for the automatic on/off level controller?

A

D.P Sensor

20
Q

What is the tag of the sensor in the program?

A

DP level to PV

21
Q

How does this sensor work?

A

Using pressure of the water in the tank to convert it to a 4-20 mili amp signal

22
Q

What function blocks were used in the automatic on/off level control?

A

Greater than and less than

23
Q

On/Off control with point or continuous level indication?

A

Point level control system
Created with two set points

24
Q

How was the start command built into the HMI program? What was used?

A

A less than function block. Internal control relay and a N.O contact in parallel

25
Q

How was the stop command built into the HMI program?

A

The greater than function block. Internal control relay and a N.O contact in parallel to the original stop bit

26
Q

What was the difference with the stop and start command in the push button program?

A

A N.C contact needs to be in series with original stop bit

27
Q

What function block is missing in the PB program? What is it used for?

A

A divide block is missing. It is used to calibrate DP level signal

28
Q

How can this PLC program be altered to not need internal control relays?

A

We could put a function block under start and stop commands specifically for the HMI command

29
Q

Can EQU be used for this type of control? Why or why not?

A

Yes, but it might miss the set point

30
Q

When you make changes to the PLC program how do you get it into the PLC?

A

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Automation Technology (8 decks)

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