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Automation Technology > Test Two > Flashcards

Test Two Flashcards

1
Q

What does HMI stand for?

A

Human Machine Interface

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2
Q

What can the HMI take the place of?

A

Hard wire inputs and outputs

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3
Q

What input can be sent to the PLC from the HMI?

A

Analog

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4
Q

What does the HMI send and receive from the PLC?

A

Sends and receives information and/or analog inputs or outputs

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5
Q

What is the input to the PLC such as the measurement of the water level in the tank? How can it be viewed?

A

Analog. It can be viewed by the operator at the HMI

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6
Q

How many pages does the HMI have the ability to have?

A

Multiple

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7
Q

How does the HMI communicate?

A

Ethernet

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8
Q

What could using a system that can accept an operator interface allow for control of the system?

A

Multiple Locations

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9
Q

What can be viewed on the HMI screen?

A

Graphs, trends, alarms, and outputs, from the PLC

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10
Q

Where can the set point be monitored from? How can this help the operator?

A

The set point can be monitored from the HMI and this can help the operator tune the loop

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11
Q

What do panel view and the PLC run on?

A

Separate Programs and 24 volts

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12
Q

What is the objective when tuning a loop?

A

Maintain a set point

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13
Q

In reference to a control loop, is over shooting known to be good or bad? How about undershooting?

A

It is a bad thing while undershooting is okay

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14
Q

What is one way to tell a control loop is not properly tuned or consistently meeting set points?

A

If it is inconsistent or hunting

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15
Q

What is it known as when an actuator controlling a process continually goes on and off?

A

Oscillating

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16
Q

What kind of inputs are from the HMI screen to the PLC for the solenoid valves?

A

Discrete inputs

17
Q

What can you change from the HMI when accessing the auto level control for valve position or pump speed?

A

The set point

18
Q

What do you have to do in order to tune the level control loop?

A

You need to access the PID block inside of RS Logix 5000

19
Q

What does it mean if a control loop is hunting?

A

It could mean that it is in search for a better tune

20
Q

What do the letters P,I,D stand for?

A

Proportional Integrative derivative

21
Q

What do the 120v solenoid valves require to be actuated?

A

Solid state relay

22
Q

How are the two solenoid valves on the discharge line of the lab station actuated?

A

By a 24 VDC signal from the PLC

23
Q

What can using an HMI or a system with Ethernet communication enable the operator to do?

A

It can allow them to operate and monitor the system from remote or multiple locations

24
Q

True or false- If the HMI were not available at the lab station you could operate the valves with the green push buttons on the outside of the cabinet. The VFD however would have to be operated from the keypad of the for start command and speed reference

A

False

25
Q

True or false- The PATT system has only one voltage source and supply associated with it. That voltage supply is 24VDC

A

False

26
Q

What button is used to go from one screen to the next in the HMI application?

A

Navigation

27
Q

In the pump and valve tune screens what colors are used and what are they representing?

A

Green- Actual Level
Red- Pump Speed
Blue-Set Point

28
Q

When observing the well tuned control loop how did the output the the final control element react to a deviation from the set point?

A

Its an inverse response

29
Q

When the system was untuned how was the output to the actuator or final control element reacting to a deviation from the set point?

A

It was oscillating

30
Q

What is the primary element for our level control system in the lab?

A

D.P Level Sensor

31
Q

What is the PV or process variable for the control loop in lab?

A

Water level

32
Q

For the valve level control with valve position, what are the control signals being used?

A

Electronic signal
Pneumatic signal
Ethernet signal

Automation Technology (8 decks)

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