Ch 5 PLC

Pole

A ___ is a completely isolated circuit that a relay can switch

High-power load

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

Network control system

A ___ is a system of computers, terminals, and PLCs connected by communication lines.

Transformer

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

Magnetic

A ___ motor starter is a motor starter that has an electrically operated mechanical switch with overload protection.

Digital

A ___ output 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.

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.

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.

Control relay

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

Output component

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

False

AN electric motor drive cannot accept an analog signal from a 1kΩ to 10kΩ variable resistor, a 0 VDC to 10 VDC voltage source, or a 4mA to 20mA current source as a control signal.

Contactor

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

Pneumatic

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

False

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

Analog electrical circuit

An ___ is a circuit in which the load can be in any operating condition between an including fully ON and fully OFF.

Interface devices

An ___ is an item that allows variously rated components to be used together in the same circuit.

Electronic

An ___ 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.

False

An analog signal is an electronic signal that has two specific quantities that change in discrete steps.

False

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

True

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

True

Analog-controlled output devices such as variable position valves allow the valve's fluid flow to be controlled anywhere between no flow and maximum flow.

True

Basic electrical circuits include switches that turn loads 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.

False

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

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.

Analog output

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

True

Magnetic motor starters, heating contactors, 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.

Communication lines

PLCs and PCs are interconnected through ___ to form various types of networks.

False

Solid-state relays can be rated for billions of operations

Analog signal

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

Contacts

The ___ of interface devices can be mechanical or solid-state.

Greater control circuit

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 ___ to control an analog circuit that controls a motor will save energy.

Signal converter

When PLC in output put sections or modules are designed for a specific type of analog signal but the sensor has digital 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

True

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 over a distance.

Digital circuits

___ operate using binary signals that have only two operating states.

Analog

___SSRs control the output voltage to a load.

Solid-state

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