What is an address in the context of a PLC’s memory?

It is a label or number that indicates where a certain piece of information is located

It is a label or number that indicates the serial number of the PLC

It is a label or number that indicates the power consumption of the PLC

It is a label or number that indicates the manufacturing date of the PLC

What is a bit in the context of binary digits?

A digit that can be either 0 or 1

A digit that can be either 2 or 3

A digit that can be either 1 or 2

A digit that can be either 3 or 4

What is a tag in the context of data storage?

An alphanumeric name assigned to all data

A symbolic name assigned to all data

An alphabetic name assigned to all data

A numeric name assigned to all data

What type of devices are discrete or digital type input modules designed to monitor?

selector switches, pushbuttons, and limit switches

temperature sensors and pressure sensors

lights, relays, solenoids, and motor starters

microprocessors and memory modules

What is the purpose of backplane power in a PLC module?

to power the electronics that reside on the I/O module circuit board

to power the external devices connected to the PLC module

to power the cooling system of the PLC module

to power the communication system of the PLC module

What are the two basic sections of the input circuit?

The power section and the logic section

The power section and the output section

The logic section and the output section

The input section and the output section

What is a characteristic of the discrete relay contact output module?

It uses electromechanical as the switching element and can be used with both AC and DC devices

It uses electromechanical as the switching element and can only be used with AC devices

It uses solid-state as the switching element and can be used with both AC and DC devices

It uses solid-state as the switching element and can only be used with DC devices

What does it mean when a device is said to be sourcing current?

It provides current when it is ON

It receives current when it is OFF

It provides current when it is OFF

It receives current when it is ON

What does it mean when a device is said to be sinking current?

It receives current when it is ON

It receives current when it is OFF

It provides current when it is ON

It provides current when it is OFF

When are analog input and output modules used?

When the control process requires the continuously variable type of control.

When the control process requires the discrete or digital ON/OFF types.

When the control process requires a fixed type of control.

When the control process does not require any type of control.

What are some examples of typical analog input detection devices?

Temperature sensors, potentiometers, and ultrasonic proximity sensors.

Pressure valves, meters, and DC motors.

Control valves, meters, and stepper motors.

Digital sensors, binary sensors, and infrared sensors.

What are some examples of typical analog output control devices?

Control valves, meters, and stepper motors.

Temperature sensors, potentiometers, and ultrasonic proximity sensors.

Pressure valves, meters, and DC motors.

Digital sensors, binary sensors, and infrared sensors.

What are the two basic types of analog input modules?

Voltage sensing and current sensing.

Weight sensing and level sensing.

Speed sensing and flow sensing.

Pressure sensing and position sensing.

How do current input signals compare to voltage signals in terms of sensitivity to noise?

Current input signals are less sensitive to noise than voltage signals.

Current input signals and voltage signals have the same sensitivity to noise.

Current input signals are more sensitive to noise than voltage signals.

Current input signals have no sensitivity to noise.

Why is a twisted shielded pair cable used in wiring the circuit?

To reduce unwanted electrical noise signals.

To decrease the signal strength.

To increase the electrical noise signals.

When would unipolar modules be used?

If the field device outputs 0 to +10 V.

If the field device outputs -10 to +10 V.

If the field device outputs +10 to +20 V.

If the field device outputs 0 to -10 V.

What does the resolution of an analog input channel refer to?

The smallest change in input signal value that can be sensed.

The change in input signal value that cannot be sensed.

The average change in input signal value that can be sensed.

The largest change in input signal value that can be sensed.

What does a transducer do in a field device?

It converts a field device’s variable into a very lowlevel electric signal

It amplifies the electric signal of a field device.

It converts a field device’s variable into a high-level electric signal.

It reduces the electric signal of a field device.

What happens to the low-level electric signal generated by the transducer?

It is amplified by a transmitter and then input into the analog module.

It is transformed by a transmitter and then input into the analog module.

It is converted by a transmitter and then input into the analog module.

It is reduced by a transmitter and then input into the analog module.

What does scaling allow you to do with an analog input from a sensor?

Convert it to the engineering units required by the application.

Convert it to non-engineering units required by the application.

Amplify it to the engineering units required by the application.

Reduce it to the engineering units required by the application.

What is the function of memory in a PLC?

Stores information, programs, and data

Provides power to the processor and I/O modules

What happens to volatile memory when all operating power is lost or removed?

It loses its stored information

It retains its stored information

What is the function of nonvolatile memory in a PLC?

It retains stored information when power is removed

It becomes volatile when power is removed

It loses its stored information when power is removed

What is the function of Read Only Memory (ROM) in a PLC?

It stores programs and data that define the capabilities of the PLC

It provides some level of security against unauthorized or unwanted changes

It is used as a temporary storage area of data

What is the characteristic of Random Access Memory (RAM) in a PLC?

It can only be erased with an ultraviolet light

What is the function of Erasable Programmable Read-Only Memory (EPROM) in a PLC?

It provides some level of security against unauthorized or unwanted changes

It is used as a temporary storage area of data

It stores programs and data that define the capabilities of the PLC

What is the characteristic of Electrically Erasable Programmable Read-Only Memory (EEPROM) in a PLC?

It can only be erased with an ultraviolet light

What is the function of flash memory in a PLC?

It automatically backs up parts of RAM

It is used as a temporary storage area of data

It stores programs and data that define the capabilities of the PLC

What is the function of a programming terminal device in a PLC?

To enter, modify, and troubleshoot the PLC program

To provide power to the processor and I/O modules

What does a Human Machine Interface (HMI) allow the operator and management to do?

View the operation in real time

Provide power to the processor and I/O modules

What are the major tasks in the development of an HMI application?

Insert the graphical objects on the screen

Set up the communication with the PLC

How is screen resolution expressed in an HMI operator panel?

As width × height, with the units in pixels

In terms of the number of colors it can display

What is the purpose of an indicator in an instrument system?

To provide a human-readable indication of an instrument signal

To perform conversion calculations

To transmit a standard instrument signal

What is a common feature of process transmitters?

They just transmit a standard instrument signal to another device

They can only connect to one indicator

They are always located near the indicators

They are always equipped with readouts

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary function of input interface modules in a controller?

Convert signals from the machine or process devices into signals that can be used by the controller

Filter the signals from the machine or process devices

Convert signals from the controller into signals for the machine or process devices

Amplify the signals from the machine or process devices

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary function of output interface modules in a controller?

Amplify the controller signals

Convert controller signals into external signals

Filter the controller signals

Convert external signals into controller signals

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does Distributed I/O refer to in the context of a PLC system?

Inputs and outputs located at a machine and controlled remotely from the PLC

Inputs and outputs located remotely and controlled locally from the PLC

Inputs and outputs located remotely and controlled remotely from the PLC

Inputs and outputs located at a machine and controlled locally from the PLC

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a rack referred to when it is located away from the processor module?

An external rack

A remote rack

A local rack

A distant rack

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the advantage of using a fiber optic cable between the CPU and I/O rack?

It allows for operation of I/O points from distances greater than 2 miles with no voltage drop

It allows for operation of I/O points from distances greater than 20 miles with no voltage drop

It allows for operation of I/O points from distances less than 20 miles with no voltage drop

It allows for operation of I/O points from distances less than 2 miles with no voltage drop

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the advantage of using a coaxial cable for remote I/O installation?

It allows remote I/O to be installed at distances greater than 20 miles

It allows remote I/O to be installed at distances greater than two miles

It allows remote I/O to be installed at distances less than 20 miles

It allows remote I/O to be installed at distances less than two miles

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the memory system of a PLC store?

Information about the manufacturer of the PLC

Information about the programming language used in the PLC

Information about the status of all the inputs and outputs

Information about the power supply of the PLC

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