Plc 1 Test 1

Front 1

What are the factors that contribute to the dynamic response of a closed loop system?

Back 1

Response time of devices, transit time of signal, static and dynamic inertia.

Front 2

Which system has the fastest response time to a set point change?

Back 2

Usually motion control.

Front 3

Which system's primary purpose is to maintain a constant condition of the controlled variable?

Back 3

Usually process control.

Front 4

What are the two types of systems?

Back 4

Process control and motion control.

Front 5

Name two classifications of industrial control systems?

Back 5

Motion control, process control.

Front 6

What's another name for motion control?

Back 6

Servo control/servo mechanism control.

Front 7

What are two types of process control?

Back 7

Batch control and continuous control.

Front 8

What is the cause of change in a controlled variable?

Back 8

A disturbance to the system.

Front 9

Is a disturbance measurable?

Back 9

Could be measurable, could be unmeasurable.

Front 10

What's an example of a disturbance to a system?

Back 10

Adding cold water, robot arm dropping a previously held weight, etc.

Front 11

What's the purpose of feed forward control?

Back 11

To measure and correct for disturbances to try to keep controlled variable from changing.

Front 12

What's another name for controlled variable?

Back 12

Process variable.

Front 13

What's the definition or controlled variable?

Back 13

The variable you're trying to keep constant or control the rate of change of.

Front 14

What's an example of a controlled variable in a process control system?

Back 14

Temperature, pressure, flow level.

Front 15

What's an example if a controlled variable in a motion control system?

Back 15

Speed, torque, direction.

Front 16

What's a measured variable?

Back 16

The variable we measure that indicates the condition of the controlled variable.

Front 17

Is the measured variable measures directly or indirectly?

Back 17

It can be measures directly or indirectly.

Front 18

When measured directly, what is the measured variable?

Back 18

The same as the controlled variable.

Front 19

What's an example of a direct measured variable?

Back 19

Using a float to monitor water level.

Front 20

What's an example of an indirect measured variable?

Back 20

Measuring weight of container to determine the level of the water.

Front 21

What's another generic name for a measurement device?

Back 21

Transducer, sensor, detector, etc.

Front 22

What's the definition of a measurement device?

Back 22

A device that converts one form of energy into another form of energy.

Front 23

Is a switch a measurement device?

Back 23

No. Measurement devices have a range, while switches are on/off.

Front 24

What's a specific example of a measurement device?

Back 24

Thermometers, flow sensors, pressure sensors, tachometer.

Front 25

What is a feedback signal?

Back 25

A signal produced by a measurement device.

Front 26

What's an example of a feedback signal?

Back 26

Pulses, electrical signal voltage/current, or pneumatic signals.

Front 27

What's a setpoint also known as?

Back 27

A reference point.

Front 28

What's the definition of a set point?

Back 28

It indicates the desired condition of a controlled variable.

Front 29

What is an error detector also known as?

Back 29

A comparator/summing junction.

Front 30

What's the definition of an error detector?

Back 30

Compares feedback signal with the set point signal.

Front 31

What's an error signal?

Back 31

A small electrical signal, voltage or current, generated be the error detector.

Front 32

What is the voltage usually generated by the error detector?

Back 32

10-12 volts.

Front 33

What is the amperage usually generated by the error detector?

Back 33

Under 20mA

Front 34

What is the controller also known as?

Back 34

The brains of the system.

Front 35

What does the controller contain?

Back 35

The error detector/signal/signal converter.

Front 36

What is the controller's output signal?

Back 36

Either electrical or pneumatic.

Front 37

What is the actuator also known as?

Back 37

The final control element.

Front 38

What's the definition of the actuator?

Back 38

A device that changes the controlled variable.

Front 39

What's an example of an actuator?

Back 39

A valve that can let more steam into a system. A servo motor that spins faster or slower.

Front 40

What's the manipulated variable?

Back 40

The variable that gets changed by the actuator to change the controlled variable.

Front 41

What's an example of the manipulated variable?

Back 41

Steam flow, pulse width modulated signal.

Front 42

What is the manufacturing process?

Back 42

A combination of measurements and error controls in order to produce a controlled variable.

Front 43

What's a disturbance?

Back 43

A physical action that can change the manufacturing process and therefore the controlled variable.

Front 44

What's an example of a disturbance?

Back 44

Adding cold water to a system, changing the load weight in a system.

Front 45

What are three ways an error can develop in feedback control systems?

Back 45

Setpoint changes, load changes, disturbance.

Front 46

What is feed forward?

Back 46

Monitoring disturbances to try to minimize the change in a system.

Front 47

What is a feedback system?

Back 47

Monitoring the change in a system and trying to correct it.

Front 48

Which can be used independently, feedback or feed forward?

Back 48

Feedback.

Front 49

What is feed forward used in conjunction with?

Back 49

Feedback.

Front 50

What are four common characteristics of a motion control system?

Back 50

Speed, position, direction, accel/deceleration.

Front 51

What is this?

Back 51

A closed loop system.

Front 52

What is this?

Back 52

Open loop system.

Front 53

Label with devices

Back 53

Front 54

Label

Back 54

Front 55

Label

Back 55