Plc chapter 5

analog SSR

A ( n ) ____connected to a PLC analog output module can be used to control a heating element in industrial applications

Analog Circuits

A ( n ) is a circuit in which the load can be in any operating condition between and including fully ON and fully OFF .

Pole

A ( n ) is a completely isolated circuit ( contact ) that a relay can switch .

Control relay

A ( n ) is a device that controls an electrical circuit by opening and closing contacts in another circuit

Analog output device

A ( n ) is a load or actuator that delivers a variable position or speed according to the analog signal (voltage or current) being sent from the plc analog output terminal

High power load

A ( n ) is a load whose voltage and current rating is greater than the voltage and current rating of the PLC output section .

transformer

A ( n ) is a typical interface device that allows two parts of an electrical circuit that normally would not work together to work together

interface device

A ( n ) is an item that allows variously rated ( voltage and current ) components to be used together in the same circuit .

Output component

A ( n ) is used to produce work , light , heat , or sound or to display information .

Magnetic

A ( n ) motor starter is a motor starter that has an electrically operated mechanical switch with overload protection

Digital

A ( n ) output ( open or closed switch ) form the output section of a PLC can be used to control the digital functions on a drive , such as turning the motor in forward or reverse .

Electronic

A ( n ) system is a primary system in which electricity is monitored and controlled to send and / or receive information , produce sound or vision , store data , control circuits , or perform other work .

Pneumatic

A _____system is a fluid power system that transmits power using a gas ( air ) .

Contactor

A ____is a control device that is designed to control high - power , non - motor loads .

True

A basic circuit must include a protection device to ensure that the circuit operates safely and within designed electrical limits .

False

A break is the number of contact positions per pole

False

An electric motor drive cannot accept an analog signal from a 1 k ohm to 10 k ohm variable resistor (potentiometer), a 0 VDC to 10 VDC voltage source or a 4 mA to 20 mA current source as a control signal .

True

Analog controlled output devices such as variable position valvesallows the valves fluid flowto be controlled anywherebetween no flow totally closed, and maximum flow totally opened

all of the above

Analog input devices include _____sensors , position sensors , and weight sensors .

False

Analog input signals are typically used to turn motors and actuators ON and OFF

True

Analog sensors are used to send signals that represent a changing pressure , temperature , or fluid level to a PLC

True

Basic electrical circuits include switches that turn loads ON or OFF .

analog output

Magnetic motor starters , heating contactors , lighting contactors , and control relays are not used as____ devices .

True

Magnetic motor starters , heating contatctors, lighting contactors, and mechanical relays are not used with analog signals from a PLC .

False

PLC input sections or modules are designed for any type of analog input signal controlled

Communication lines

PLC's and PCs are interconnected through____to form various types of networks

False

When a heating element circuit is hardwired into a PLC circuit , the heating contactor coil and heater ON lamp are typically wired in parallel .

Work

is the movement of a load ( in pounds ) over a distance ( in feet )

False

Hardwired and PLC controlled heating element circuits respond differently

False

In a hardwired heating element circuit , the circuit can easily be changed or modified without rewiring the control circuit .

True

Input modules that are connected directly to a 115 VAC supply will be damaged .

True

Interfacing systems allow primary systems that cannot work together to be compatible

network Control

A( n ) is a system of computers , terminals , and PLCs connected by communication lines

False

All analog output devices must be connected through an interface device such as an analog ssr or relay

False

An analog signal is an electronic signal that has two specific quantities that change in discrete steps ( ON or OFF ) .

True

Circuit conditioning in an electrical system can include changing AC to DC

False

Circuit conditioning is not a requirement even when the existing electrical power is not at the proper phase , voltage , or current level for the application .

True

Contactors are required between a PLC output section and high - power load .

True

Digital circuits turn loads fully ON or fully OFF

True

Electric motor drives are designed to accept any type of analog signal to control the speed of a motor

True

Electrical systems are made up of basic and complex circuits .

True

Solid - state relays can be rated for billions of operations .

all of the above

Some applications require an analog input signal to provide a variable range for_____or level measurements

Analog signals

Some_ can be directly connected to a PLC analog input section or module , while other PLCs require the analog signal to first be converted into a voltage or current signal that is within the specified range of the PLC's input section or module .

speed

The _____of a motor will be directly proportional to the variable power received from a drive

Greater circuit control

The advantage of using a PLC with both digital and analog input terminals and / or output terminals is that is provided , and as a result , better control of the application occurs

False

The smaller the number of basic circuits in an electrical system the more likely a PLC will be used to reduce cost , simplify wiring , and monitor circuit operation

PLC

The use of a ( n )_____ to control an analog circuit that controls a motor will save energy .

Contacts

The____of interface devices can be mechanical or solid state

Signal converter

When PLC input sections or modules are designed for a specific type of analog signal put the sensor has digital output signals , a ( n ) ____must be used

True

When a PLC is used to control a system , system operation can be monitored and easily changed by reprogramming the process control circuit

Analog

____SSRS control the output voltage to a load

Electric Motor

_____drives are used to control the speed of electric motors and reduce the amount of power they consume .

Digital circuits

____operate using binary signals that have only two operating states .

electromechanical

____relays draw high current when energized and produce high voltage spikes when de - energized .