Term
| If all the units are in one fixed enclosure, the PLC is called a ____ PLC |
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Definition
|
|
Term
| The four major components of a PLC power supply are a line conditioner or varistor, transformer/rectifier unit, RC filter, and ____. |
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Definition
|
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Term
| A(n) ____ is a semiconductor device that can maintain a steady voltage level. |
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Definition
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Term
| . A ____ converts the digital output signals back to analog signals |
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Definition
| Digital to Analog Converter (DAC) |
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Term
| The ____ segment holds the ladder logic program |
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Definition
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Term
| The section of the PLC system memory that holds the status of discrete input ports is the ____ status |
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Definition
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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. |
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Definition
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Term
T/F
Discrete input ports are ports that are either open (off) or closed (on). |
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Definition
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Term
T/F
Static RAM (SRAM) stores data in the form of charge on capacitors. |
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Definition
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Term
T/F
The arithmetic logic unit (ALU) carries out math and logic instructions |
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Definition
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Term
T/F
When selecting PLCs that meet your needs, you should consider manufacturer’s support, serviceability, and programming software |
|
Definition
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Term
T/F
The user memory segment stores information needed to execute the user program |
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Definition
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Term
T/F
Simplex channeling occurs when the DTE either transmits data to or receives data from the DCE |
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Definition
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Term
T/F
In half duplex channeling, the DTE transmits data to and receives data from the DCE through two separate transmission lines |
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Definition
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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 |
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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
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Term
| What is the difference between a Fixed PLC system and a Modular PLC system? |
|
Definition
Fixed: Set number of IO
Modular: Expandable
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|
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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. |
|
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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
|
|
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
|
|
Term
| How many output instructions you can place in series in a ladder logic diagram? |
|
Definition
|
|
Term
| hat type of instruction you must place as a last instruction on a rung of a ladder logic diagram? |
|
Definition
|
|
Term
| Can the same input or output instruction be used more than one time in a ladder logic diagram? |
|
Definition
|
|
Term
| The instruction with address I:1/2 represents the PLC input port ______ in the PLC module _____. |
|
Definition
|
|
Term
| The instruction with address O:2/0 represents the PLC output port ______ in the PLC module ____ . |
|
Definition
|
|
Term
T/F
You can place two or more input instructions in series in a PLC ladder logic rung. |
|
Definition
|
|
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
|
|
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
|
|
Term
| Same input address instructions may be used two or more times in a PLC ladder logic diagram. |
|
Definition
|
|
Term
| Same output address instructions may be used two or more times in a PLC ladder logic diagram |
|
Definition
|
|
Term
| An address number writes over the instruction description for an Input or Output instruction. |
|
Definition
|
|
Term
| The address for bit 10 in word 5 for the SLC 500 is ________. |
|
Definition
|
|
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
|
|
Term
| The Main PLC ladder logic diagram is always in file number ____ |
|
Definition
|
|
Term
| PLC subroutine ladder logic diagrams may be placed in file number ______ to file number ______. |
|
Definition
|
|
Term
| Every subroutine file must have a _________ instruction in their last rung. |
|
Definition
|
|
Term
| You may use the _______________ instruction in the main ladder logic diagram to call a subroutine ladder logic diagram |
|
Definition
|
|
Term
| The subroutine instructions are in the __________ instruction group |
|
Definition
|
|
Term
| LATCH/UNLATCH coils and contacts must have the same ____ address. |
|
Definition
|
|
Term
| You must energize the ______ coil to close an XIC LATCH/UNLATCH contact |
|
Definition
|
|
Term
| You must energize the ______ coil to open an XIC LATCH/UNLATCH contact |
|
Definition
|
|
Term
| Bit addresses b3/0 through b3/255 or ____ through ____ may be used for LATCH/UNLATCH. |
|
Definition
|
|
Term
| To LATCH/UNLATCH a contact, ______ push buttons are used. |
|
Definition
|
|
Term
| You may use the FORCE function to force an input instruction _____ or _____. |
|
Definition
|
|
Term
| You may use the FORCE function to energize or de-energize _______ instruction. |
|
Definition
|
|
Term
| When a FORCE function is enabled, the force ON/OFF words is in ____ colors. |
|
Definition
|
|
Term
| Use the ________ icon in the project tree area to open the Input Forces dialog boxes. |
|
Definition
|
|
Term
| In the Input Forces dialog box, place a ___ to force an input instruction ON. |
|
Definition
|
|
Term
T/F
Program file number seven can be used for PLC subroutine ladder logic diagram. |
|
Definition
|
|
Term
T/F
System data files zero and one are not available to a PLC programmer. |
|
Definition
|
|
Term
| The T4 data file is used for timer functions. |
|
Definition
|
|
Term
T/F
The R6 data file is used for counter functions |
|
Definition
|
|
Term
T/F
On Line editing commands are available for all SCL500 series processors. |
|
Definition
|
|
Term
| You may use the PLC FORCE function in a manufacturing plant when assembly line workers are present. |
|
Definition
|
|
Term
| Two pushbuttons are typically used for each LATCH/UNLATCH function |
|
Definition
|
|
Term
| It is better to name each of the PLC subroutines |
|
Definition
|
|
Term
| You must specify the subroutine file number in a JSR function. |
|
Definition
|
|
Term
| The Data File S2 dialog box displays the error messages. |
|
Definition
|
|
Term
| Allen-Bradley SLC 500 PLCs have Channel __________________ and Channel _____________ that can be used for communications |
|
Definition
|
|
Term
| A unit for measuring the speed of serial communication transmission is the _________________________ rate |
|
Definition
|
|
Term
| Transmitted data that have an even number of ones uses _________________________ parity. |
|
Definition
|
|
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
|
|
Term
| A sinking input device must be connected to a(n) ______________________________ input module port. |
|
Definition
|
|
Term
| A sourcing output device must be connected to a(n) ______________________________ output module port. |
|
Definition
|
|
Term
| The ______________________________ is a rack that serves as an electrical backplane for a PLC processor and I/O modules. |
|
Definition
|
|
Term
| The ______________________________ Allen-Bradley SLC 500 PLCs give you the option of chassis, power supply, processor, and I/O modules. |
|
Definition
|
|
Term
| The three different types of PLC programming modules are handheld, dedicated, and ___________________. |
|
Definition
|
|
Term
| Two types of motor overload relays are available in industry: temperature overload relays and ______________. overload relays. |
|
Definition
|
|
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
|
|
Term
| A(n) ______________________________ pushbutton or switch is always open—until it is forced to close |
|
Definition
|
|
Term
| A(n) ______________________________ pushbutton or switch is always closed—until it is forced to open |
|
Definition
|
|
Term
| Momentary pushbuttons, also called ______________________________ pushbuttons, change their states from open to closed or from closed to open. |
|
Definition
|
|
Term
| Ultrasonic sensors use sound waves with frequencies above ______________________________ kHz in order to detect the distance to an object. |
|
Definition
|
|
Term
| A relay is a device that acts on the same basic principle as the ______________________________ switch. |
|
Definition
|
|
Term
| A(n) ______________________________ is a control device that uses electromagnetism to convert electrical energy into mechanical motion. |
|
Definition
|
|
Term
| A(n) ______________________________ simply turns a motor on and off |
|
Definition
|
|
Term
| A(n) ______________________________ is typically used in the control of low-power circuits or other relays. |
|
Definition
|
|
Term
| SLC is an acronym for _____. |
|
Definition
|
|
Term
| SRAM uses a(n) _____ to hold a data bit |
|
Definition
|
|
Term
| CPU is an acronym for _____. |
|
Definition
|
|
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
|
|
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
|
Definition
| Basic Input Output System |
|
|
Term
| The MPU uses _____ memory to speed up the data transfer |
|
Definition
|
|
Term
| The software that resides in ROM is called _____. |
|
Definition
|
|
Term
| A microprocessor unit (MPU) uses a(n) _____ to enable ROM, RAM, I/O port devices, and support chips |
|
Definition
|
|
Term
| The unit of transmission for measuring the speed of communication is _____ |
|
Definition
|
|
Term
Digital, or variable, output modules use _____ ICs to convert digital data supplied by the PLC processor to
scalable voltage or current output. |
|
Definition
|
|
Term
| A(n) _____ check is used to fi nd transmission errors. |
|
Definition
|
|
Term
| The normally _____ pushbuttons and switches are always open—until they are forced to close |
|
Definition
|
|
Term
| Light-emitting diodes (LEDs) and laser diodes are used in _____ sensors |
|
Definition
|
|
Term
Ultrasonic sensors use sound waves with frequencies above _____ kHz in order to detect the distance to an
object. |
|
Definition
|
|
Term
In general, a relay consists of a magnetic core and its associated coil, _____, spring, armature, mounting, and
terminals. |
|
Definition
|
|
Term
| A(n) _____ is a control device that uses electromagnetism to convert electrical energy into mechanical motion |
|
Definition
|
|
Term
| A(n) _____ simply turns a motor on and off |
|
Definition
|
|
Term
| The two main sections of motor starters are _____ and overload protection. |
|
Definition
|
|
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
|
|
Term
| A(n) _____ sensor is basically a semiconductor device (transistor) that can be switched by magnetic fields |
|
Definition
|
|
Term
| Slowly accelerating a motor from standstill to operating speed is referred to as _____. |
|
Definition
|
|
Term
| A(n) _____ sensor detects the presence of currents induced by magnetic fields to detect nearby metallic objects. |
|
Definition
|
|
Term
| A(n) _____ sensor detects an object through the change in the sensor’s dielectric |
|
Definition
|
|
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
|
|
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
|
|
Term
| Rule two states that one (and only one) _____ is placed near the right corner of the rung. |
|
Definition
|
|
Term
| According to rule four, output devices cannot be connected in _____. |
|
Definition
|
|
Term
| According to rule six, all the input and output devices must be placed _____ |
|
Definition
|
|
Term
| In the relay logic diagram, _____ must flow from left to right |
|
Definition
|
|
Term
| An Allen-Bradley SLC 500 series PLC has integer words addressed from _____ to _____. |
|
Definition
|
|
Term
| An Allen-Bradley SLC 500 series PLC has timers addressed from _____ to _____. |
|
Definition
|
|
Term
| An Allen-Bradley SLC 500 series PLC has counters addressed from _____ to _____. |
|
Definition
|
|
Term
| In order to change the program, the PLC must be in _____ mode. |
|
Definition
|
|
Term
A method of testing the PLC system without actually closing or opening input devices is to test the PLC in the
_____ mode. |
|
Definition
|
|
Term
| The main ladder logic diagram is held in _____. |
|
Definition
|
|
Term
| File number _____ and _____ are system files. |
|
Definition
|
|
Term
| The control registers for an Allen-Bradley SLC 500 series PLC are addressed from _____ to _____. |
|
Definition
|
|
Term
| In an XNOR gate ladder logic diagram, when both inputs are open, the output is _____. |
|
Definition
|
|
Term
| In an XNOR gate ladder logic diagram, when one input is closed and the other one is open, the output is _____. |
|
Definition
|
|
Term
| . In a one-rung XNOR gate ladder logic diagram, the normally closed inputs are connected in _____ |
|
Definition
|
|
