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Flex Auto EET
Flexible Automation EET UC
145
Electrical Engineering
Undergraduate 3
02/13/2017

Additional Electrical Engineering Flashcards

 


 

Cards

Term
If all the units are in one fixed enclosure, the PLC is called a ____ PLC
Definition
Fixed
Term
The four major components of a PLC power supply are a line conditioner or varistor, transformer/rectifier unit, RC filter, and ____.
Definition
Zener Diode
Term
A(n) ____ is a semiconductor device that can maintain a steady voltage level.
Definition
Zener Diode
Term
. A ____ converts the digital output signals back to analog signals
Definition
Digital to Analog Converter (DAC)
Term
The ____ segment holds the ladder logic program
Definition
User Memory
Term
The section of the PLC system memory that holds the status of discrete input ports is the ____ status
Definition
Input
Term

T/F

One benefit of PLCs over electromechanical relay logic systems is PLCs require minor wiring and can be modified and reprogrammed within a few hours.

Definition

 

True

Term

T/F

Discrete input ports are ports that are either open (off) or closed (on).

Definition
True
Term

T/F

Static RAM (SRAM) stores data in the form of charge on capacitors. 

Definition
False (DRAM)
Term

T/F

The arithmetic logic unit (ALU) carries out math and logic instructions

Definition
True
Term

T/F

When selecting PLCs that meet your needs, you should consider manufacturer’s support, serviceability, and programming software

Definition
True
Term

T/F

The user memory segment stores information needed to execute the user program

Definition
False (System Memory)
Term

T/F

Simplex channeling occurs when the DTE either transmits data to or receives data from the DCE

Definition
True
Term

T/F

In half duplex channeling, the DTE transmits data to and receives data from the DCE through two separate transmission lines

Definition
False (Full Duplex)
Term

T/F

Sourcing occurs when the current flows out of the PLC port and sinking occurs when the current flows into the PLC port.

Definition

True

SOurce: Current OUT

SInk: Current In

Term
What is the difference between a discrete PLC input port and a variable PLC input port?
Definition

Discrete: DC 24V

Analog: Variable 4mA to 20mA

 

Term
What is the difference between a Fixed PLC system and a Modular PLC system?
Definition

Fixed: Set number of IO

Modular: Expandable

 

Term
What are the four major components of a PLC device?
Definition

CPU

Power Supply

I/O Modular 

Chassis

Term
What is the difference between system PLC memory and user PLC memory?
Definition

System Memory: OS 25%

User Memory: PLC Program 75%

Term
List at least five data that is held in PLC system memory.
Definition

Timer

Counter

Input

Output

Bit

Term

 Which of the following statements is not correct?

 

A) Input and output instructions in ladder logic do not directly represent the switches and actuators.

B) The PLC rung output [-( )-] is a discrete output instruction or bit in memory.

C) Each rung of the ladder logic represents a logical statement executed in software inputs on the right and outputs on the left.

D) PLC input instructions are logical symbols associated with voltage at the input module terminals. 

Definition
C) Each rung of the ladder logic represents a logical statement executed in software inputs on the right and outputs on the left.
Term
PLCs are ________ designed for use in the control of a wide variety of manufacturing machines and systems.
Definition
B) special-purpose industrial computers
Term

Which of the following statements is correct?

 

A) A ladder logic program is hard to analyze because it is totally different when compared with the equivalent relay logic solution.

B) The number of ladder logic virtual relays and input and output instructions is limited only by memory size. C) Ladder logic is a PLC graphical programming technique introduced in the last 10 years.

D) The number of contacts for a mechanical relay is limited to number of coils on the relay.  

Definition
B) The number of ladder logic virtual relays and input and output instructions is limited only by memory size.
Term

Which of the following statements is NOT correct?

A) Input (-| |-) and output (- ( ) -) instruction symbols in the ladder logic represent only data values stored in PLC memory.

B) PLCs are not as reliable as electromechanical relays in RLL.

C) The status of each input can be checked from one location and outputs can be forced on and off.

D) All symbols in the RLL represent actual components and contacts present in the control system.  

Definition
B) PLCs are not as reliable as electromechanical relays in RLL.
Term

Which of the following statements is NOT correct?

A) The cost and size of PLCs have increased significantly in the last 10 years.

B) The physical wires between the input and output field devices and the PLC input and output modules are the only signal wires required in the PLC system.

C) If a problem in a PLC module occurs, the module can be changed in a matter of minutes without any changes in wiring.

D) Outputs can be paralleled on the same rung. 

Definition
A) The cost and size of PLCs have increased significantly in the last 10 years
Term

6) When a relay is NOT energized:

A) There is an electrical path through the NO contacts.

B) There is an electrical path through the NC contacts.

C) Neither the NO or the NC contacts have an electrical path.

D) Both the NO and the NC contacts have an electrical path. 

Definition
B) There is an electrical path through the NC contacts.
Term
7) On SLC 500 models the processor is placed in:
Definition
C) Next to the power supply.
Term
A field device is connected to an input module in slot 4 at terminal 9, what is the correct SLC 500 address?
Definition
A) I:4/9
Term
An SLC 500 output address is O:2/10, what slot is the module in and what terminal is used for the connection?
Definition
Output Module 2 Terminal 10
Term
How many factors would you consider for selecting a PLC? List them.
Definition

Servacibilty 

Support

Software

IO Expnadibility

Training

Flexibility

Term
How many input instructions you can place in series in a ladder logic diagram?
Definition
Depends on memory
Term
How many output instructions you can place in series in a ladder logic diagram?
Definition
1 Output SLC 500
Term
hat type of instruction you must place as a last instruction on a rung of a ladder logic diagram?
Definition
Ouput, Counter, Timer
Term
Can the same input or output instruction be used more than one time in a ladder logic diagram?
Definition

Input: Yes

Output: No

Term
The instruction with address I:1/2 represents the PLC input port ______ in the PLC module _____.
Definition

Port: 2

Module 1

Term
The instruction with address O:2/0 represents the PLC output port ______ in the PLC module ____ .
Definition

Module 2

Port 0

Term

T/F

You can place two or more input instructions in series in a PLC ladder logic rung. 

Definition
True
Term

T/F

You can place two or more output instructions in series in a PLC ladder logic rung

Definition
False (Only 1 Output SLC 500)
Term

T/F

 You can place two or more input instructions in series or parallel with each other in a PLC ladder logic rung.

Definition
True
Term
You can place two or more output instructions in series or parallel with each other in a PLC ladder logic rung
Definition
False: Outputs cannot be in series but can be in //
Term
In a PLC ladder logic rung, the last instruction must be an output instruction
Definition
True
Term
Same input address instructions may be used two or more times in a PLC ladder logic diagram.
Definition
True
Term
Same output address instructions may be used two or more times in a PLC ladder logic diagram
Definition
False (SLC 500)
Term
An address number writes over the instruction description for an Input or Output instruction.
Definition
False
Term
The address for bit 10 in word 5 for the SLC 500 is ________.
Definition
B3:5/10
Term

 Which one of the following statements on PLC 5 and SLC 500 binary bits is NOT true?

A) The status of PLC internal relay bits is displayed in the Binary Bit Data File.

B) The quantity of internal relays is set by the rack size of the system.

C) PLC Ladder logic uses memory bits as internal relays. D) PLC internal relays are also called virtual control relays.

Definition
B) The quantity of internal relays is set by the rack size of the system
Term

The scan time ________. 

A) Is usually never over 1 millisecond

B) Is constant for all programs regardless of length

C) Determines how fast an output actuator will respond after a change in an input filed device

D) Starts with the last rung and works up to rung 0 

Definition
C) Determines how fast an output actuator will respond after a change in an input filed device
Term
The examine if closed instruction ________.
Definition
Has the following logic symbol (-| |-)
Term
The examine if open instruction ________.
Definition
A) Has the following logic symbol (-|/|-)
Term
The order of operation for a program scan is ________.
Definition
B) Read inputs; update input register; check ladder input logic; update output register; update outputs
Term

) Which one of the following scan statements is NOT true?  A) A one second scan time is common.

B) Some instructions affect the length of the scan time.

C) Allen Bradley PLCs scan from left to right and top to bottom of the ladder logic.

D) Scan time is affected by the length of the program. 

Definition
A) A one second scan time is common.
Term
In the process of developing a PLC program, the developer can always change ________ to work with the other given conditions of the system.
Definition
The input (XIC or XIO) and output (OTE, OTL, or OUT) instructions.
Term
The OTE output instruction is ________.
Definition
A) True (activated) if the rung link to the left is true
Term
The memory size of a double word is ________.
Definition
D) Four bytes
Term
The Main PLC ladder logic diagram is always in file number ____
Definition
Lad2
Term
PLC subroutine ladder logic diagrams may be placed in file number ______ to file number ______.
Definition
3 to 255
Term
Every subroutine file must have a _________ instruction in their last rung.
Definition
Return
Term
You may use the _______________ instruction in the main ladder logic diagram to call a subroutine ladder logic diagram
Definition
JSR
Term
The subroutine instructions are in the __________ instruction group
Definition
Control Group
Term
LATCH/UNLATCH coils and contacts must have the same ____ address.
Definition
bit
Term
You must energize the ______ coil to close an XIC LATCH/UNLATCH contact
Definition
Latch
Term
You must energize the ______ coil to open an XIC LATCH/UNLATCH contact
Definition
Unlatch
Term
Bit addresses b3/0 through b3/255 or ____ through ____ may be used for LATCH/UNLATCH.
Definition
b10/0 through b10/255
Term
To LATCH/UNLATCH a contact, ______ push buttons are used.
Definition
2
Term
You may use the FORCE function to force an input instruction _____ or _____.
Definition
On or Off
Term
You may use the FORCE function to energize or de-energize _______ instruction.
Definition
Output
Term
When a FORCE function is enabled, the force ON/OFF words is in ____ colors.
Definition
Red
Term
Use the ________ icon in the project tree area to open the Input Forces dialog boxes.
Definition
Force Files
Term
In the Input Forces dialog box, place a ___ to force an input instruction ON.
Definition
1
Term

T/F

Program file number seven can be used for PLC subroutine ladder logic diagram. 

Definition
True
Term

T/F

System data files zero and one are not available to a PLC programmer. 

Definition
True
Term
The T4 data file is used for timer functions.
Definition
True
Term

T/F

The R6 data file is used for counter functions

Definition
False (C5)
Term

T/F

On Line editing commands are available for all SCL500 series processors. 

Definition
False
Term
You may use the PLC FORCE function in a manufacturing plant when assembly line workers are present.
Definition
False
Term
Two pushbuttons are typically used for each LATCH/UNLATCH function
Definition
True
Term
It is better to name each of the PLC subroutines
Definition
True
Term
You must specify the subroutine file number in a JSR function.
Definition
True
Term
The Data File S2 dialog box displays the error messages.
Definition
True
Term
Allen-Bradley SLC 500 PLCs have Channel __________________ and Channel _____________ that can be used for communications
Definition
0 and 1
Term
A unit for measuring the speed of serial communication transmission is the _________________________ rate
Definition
Baud
Term
Transmitted data that have an even number of ones uses _________________________ parity.
Definition
Even
Term
In communication systems, DCE stands for ______________________________.
Definition
Digital Communication Equipment
Term
The ______________________________ instruction allows the system to run and allows the program to be modified while the system is running.
Definition
Force
Term
A sinking input device must be connected to a(n) ______________________________ input module port.
Definition
Sourcing
Term
A sourcing output device must be connected to a(n) ______________________________ output module port.
Definition
Sinking
Term
The ______________________________ is a rack that serves as an electrical backplane for a PLC processor and I/O modules.
Definition
Chassis
Term
The ______________________________ Allen-Bradley SLC 500 PLCs give you the option of chassis, power supply, processor, and I/O modules.
Definition
modular
Term
The three different types of PLC programming modules are handheld, dedicated, and ___________________.
Definition
PC
Term
Two types of motor overload relays are available in industry: temperature overload relays and ______________. overload relays.
Definition
Magnetic
Term
In an optical sensor, a(n) ______________________________ is used to generate light beams in the visible and invisible spectrums using light-emitting diodes (LEDs) and laser diodes.
Definition
Emitter
Term
A(n) ______________________________ pushbutton or switch is always open—until it is forced to close
Definition
N.O.
Term
A(n) ______________________________ pushbutton or switch is always closed—until it is forced to open
Definition
N.C.
Term
Momentary pushbuttons, also called ______________________________ pushbuttons, change their states from open to closed or from closed to open.
Definition
Spring Loaded
Term
Ultrasonic sensors use sound waves with frequencies above ______________________________ kHz in order to detect the distance to an object.
Definition
16kHz
Term
A relay is a device that acts on the same basic principle as the ______________________________ switch.
Definition
reed
Term
A(n) ______________________________ is a control device that uses electromagnetism to convert electrical energy into mechanical motion.
Definition
solenoid
Term
A(n) ______________________________ simply turns a motor on and off
Definition
Motor Starter
Term
A(n) ______________________________ is typically used in the control of low-power circuits or other relays.
Definition
Power Relay
Term
SLC is an acronym for _____.
Definition
Small Logic Controller
Term
SRAM uses a(n) _____ to hold a data bit
Definition
Transistor
Term
CPU is an acronym for _____.
Definition
Central Processing Unit
Term
PPI is an acronym for _____.
Definition
Programmable Peripheral Interface
Term
UVEPROM is an acronym for _____.
Definition
Ultraviolet Erasable Programmable Read Only Memory
Term
A(n) _____ is a sequential digital device that generates a different output for every input on the next clock pulse
Definition
Flip-Flop
Term
A(n) _____ microprocessor typically uses only one instruction for a complex command.
Definition
Reduce Instruction Set (RIS)
Term
A(n) _____ microprocessor uses several math instructions to carry out complex commands.
Definition
Conventional Instruction Set (CIS)
Term
BIOS is an acronym for
Definition
Basic Input Output System
Term
The MPU uses _____ memory to speed up the data transfer
Definition
cache
Term
The software that resides in ROM is called _____.
Definition
Firmware
Term
A microprocessor unit (MPU) uses a(n) _____ to enable ROM, RAM, I/O port devices, and support chips
Definition
Address Decoder
Term
The unit of transmission for measuring the speed of communication is _____
Definition
Baud
Term
Digital, or variable, output modules use _____ ICs to convert digital data supplied by the PLC processor to
scalable voltage or current output.
Definition
DAC
Term
A(n) _____ check is used to fi nd transmission errors.
Definition
parity
Term
The normally _____ pushbuttons and switches are always open—until they are forced to close
Definition
N.O.
Term
Light-emitting diodes (LEDs) and laser diodes are used in _____ sensors
Definition
Prox
Term
Ultrasonic sensors use sound waves with frequencies above _____ kHz in order to detect the distance to an
object.
Definition
16kHz
Term
In general, a relay consists of a magnetic core and its associated coil, _____, spring, armature, mounting, and
terminals.
Definition
Contacts
Term
A(n) _____ is a control device that uses electromagnetism to convert electrical energy into mechanical motion
Definition
Relay
Term
A(n) _____ simply turns a motor on and off
Definition
motor starter
Term
The two main sections of motor starters are _____ and overload protection.
Definition
Contactors
Term
A(n) _____ switch is used in factory environments as an emergency or contact switch when a worker is using
both hands for assembling a product.
Definition
Foot
Term
A(n) _____ sensor is basically a semiconductor device (transistor) that can be switched by magnetic fields
Definition
Hall effect
Term
Slowly accelerating a motor from standstill to operating speed is referred to as _____.
Definition
Soft Start
Term
A(n) _____ sensor detects the presence of currents induced by magnetic fields to detect nearby metallic objects.
Definition
Radar
Term
A(n) _____ sensor detects an object through the change in the sensor’s dielectric
Definition
Capacitive
Term
A(n) _____ sensor uses visible, ultraviolet, infrared, or laser lights and requires both an emitter to generate the
light beam and a detector.
Definition
Prox
Term
A(n) _____ logic diagram is created to show the logical relationship between devices.
Definition
Relay Logic Diagram (RLD)
Term
The _____ logic diagram is used to program the programmable logic controller (PLC)
Definition
Ladder Logix Diagram (LLD)
Term
There are _____ rules accepted as standard in the control industry for creating relay logic diagrams.
Definition
9
Term
Rule two states that one (and only one) _____ is placed near the right corner of the rung.
Definition
Output
Term
According to rule four, output devices cannot be connected in _____.
Definition
Series
Term
According to rule six, all the input and output devices must be placed _____
Definition
Horizontally
Term
In the relay logic diagram, _____ must flow from left to right
Definition
Current
Term
An Allen-Bradley SLC 500 series PLC has integer words addressed from _____ to _____.
Definition
N7:0 to N7:255
Term
An Allen-Bradley SLC 500 series PLC has timers addressed from _____ to _____.
Definition
T4:0 to T4:255
Term
An Allen-Bradley SLC 500 series PLC has counters addressed from _____ to _____.
Definition
C5:0 to C5:255
Term
In order to change the program, the PLC must be in _____ mode.
Definition
Program
Term
A method of testing the PLC system without actually closing or opening input devices is to test the PLC in the
_____ mode.
Definition
Forced
Term
The main ladder logic diagram is held in _____.
Definition
Lad 2
Term
File number _____ and _____ are system files.
Definition
Sy0 and Sy1
Term
The control registers for an Allen-Bradley SLC 500 series PLC are addressed from _____ to _____.
Definition
R6:0 to R6:255
Term
In an XNOR gate ladder logic diagram, when both inputs are open, the output is _____.
Definition
ON
Term
In an XNOR gate ladder logic diagram, when one input is closed and the other one is open, the output is _____.
Definition
OFF
Term
. In a one-rung XNOR gate ladder logic diagram, the normally closed inputs are connected in _____
Definition
Series
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