Plc chapter 1 & 2
The power required to operate the logic circuits of the processor unit is typically. high voltage AC low voltage AC low voltage DC high voltage DC
Low voltage DC
The diagram shown is that of a_____ input module schematic hardwired relay schematic output module schematic
hardwired relay schematic
An excellent resource for troubleshooting or debugging programs, allows you to designate memory addresses that can be monitored or modifier Interface Variable Table (VAT) Assignment Table Symbol Table
VAT
The voltage that would be present between the DC common and terminal 4 with the pushbutton open would be approximately_______ Picture 12 volts O volts 24 volts
0 volts
What is the maximum permissible current per rack? (57-300) 0.2 A 1 A 10 A 1.2 A
1.2 A
For there to be a continuous logic path from left to right across the rung______ 1/1 and 1/2 or 1/3 must be at logic level 1 1/1 and 1/2 or 1/ 3 will be at logic level O 1/1, 1/2, and 1/3 must be at logic level 0
1/1 and 1/2 or 1/3 must be at logic level 1
What is the maximum number of nodes in a PROFIBUS DP network? 256 with segments up to 32 127 in each segment. 32 with segments up to 8 127 with segments up to 32
127 with segments up to 32
Picture The voltage that would be present between the DC common and terminal 4 with the pushbutton closed would be approximately 24 volts 12 volts O volts 6 volts
24 volts
How many nodes can be present within an MPI network? 16 64 128 32
32
How many stations can a PROFIBUS DP station contain in one segment? 16 127 32 8
32
How many stations can be present in one segment of a PROFIBUS DP network? 127 16 64 32
32
For $7-300 when a digital module is configured, it is allocated ______bytes for logical addresses. 2 4 0 8
4
If a digital module's memory area starts with byte 4, which bytes are allocated to the module? 4 5. 6. 7 8 9.10. & 11 4&5 4,5,6, &7 4
4,5,6, &7
If a digital module begins with address 7, which bytes are allocated for the module? 0,1,2 & 3 9, 10, 11 & 12 7,8, 9 & 10 8,9.10 & 11
7,8, 9 & 10
How many bits comprise a byte? 8 32 16 4
8
In $7-300 controllers, how many 1/O modules can be plugged into the central rack? 16 8 32 4
8
In an S7-300 controller, how many 1/0 modules can be plugged into the central rack? 8 4 16 32
8
What is a Rack as defined by Siemens? A chassis that houses modules and connects them together. A device that accommodates the modules and connects them to each other. A backplane that modules slot into and are connected together. A device that contains a CPU.
A device that accommodates the modules and connects them to each other.
In system memory, what is a Timer? 1 A location used to implement waiting and monitoring times. 2 Information stores that are directly accessible from any point in the user program. 3 A software-level location, used for up and down counting. 4 None of these.
A location used to implement waiting and monitoring times.
The control plan stored in the PLC is called a program FORTRAN a Boolean ladder a microprocessor
A program
In PLC what is a remote rack? A wireless rack. A separate PLC rack that is tied to the primary rack. None of these A rack that is located away form the processor module near the field devices.
A rack that is located away form the processor module near the field devices.
Which of the following is not an advantage PLC offer over conventional relay-based control systems? Faster Response Time Lower Cost Communications Capability More Flexibility Ability to Control High Voltage/Current Directly
Ability to Control High Voltage/Current Directly
The_____ is a format that allows a processor to identify the memory location of an input or output. tag address symbol Data type
Address
A human machine interface (HMI) all of these can provide a graphical representation of a process allows the user to monitor a process allows the user to control a process
All of these
The CPU or Central Processing Unit is responsible to which of the following? Evaluates or processes the user program. Communicates with modules to receive and to write information. All of these. Stores the user program.
All of these
Which of the following is a function of the Processo Module or CPU? Sends appropriate output commands to control devices. Executes the stored user program from memory Accepts input data from sensing devices. All of these
All of these
Which of the following output devices are typically discrete devices? solenoids motor starters All of these. lights
All of these
[Petruzella] The programming device is used to enter the program into the memory of the porcessor all of these can be a hand-held device is commonly a computer
All of these
[Petruzella] Unlike personal computers, PLCs are designed for the industrial environment equipped with input and output modules all of these instructed with a control programming language
All of these
What is a programmable logic controller(PLC)? A computer that controls machines An industrial computer to control robots A microprocessor with a job. An industrial grade computer that is capable of being programmed to perform control functions.
An industrial grade computer that is capable of being programmed to perform control functions.
Within the Reference Data, ______ shows which bits, bytes, words, or double words in address areas 1, Q M. T, and C are used in the program. Cross-References Program Structure swer Assignments
Assignment
The_____stores and processes the user program Interface Module Power Supply Function Module CPU
CPU
Which of the following is not powered by the Power Supply? Input and Output Modules Processor Module or CPU Field Devices
Field device
The devices connected to the terminals would be classified as_____ internal input instructions field output devices field input devices
Field input devices
______1/Os are typical of small PLCs that come in one package with no separate removeable units. Analog Digital Modular Fixed
Fixed
Which of the following describes the function of 1/0 modules? Provides power to the field devices. Communicates with other CPUs, HMIs and Controllers. Evaluates the inputs and outputs. Forms the interface between the CPU and the field devices.
Forms the interface between the CPU and the field devices.
When opened, this object displays the station window and the hardware catalog. Symbol Editor Hardware Configuration VAT Table
Hardware Configuration
When opened, this object displays the station window and the hardware catalog? CPU Configuration Hardware Configuration Program Editor Station Display
Hardware Configuration
What does discrete mean when referencing field devices? On or Off (Boolean) A Range of Values (Analog. Separate Secretive
On or off
Which module of the PLC connects directly to field devices such as pilot lights, motor starters, and solenoids? Power Supply Output Memory Input
Output
This technology is used to exchange data between an engineering station and a SIMATIC station. Serial Communication PROFIBUS Communication PG Communication
PG Communication
After compiling, you can transfer the configuration data to a CPU with which step? PIC-> Save PLC -> Load PLC <- Upload PLC -> Download
PLC -> Download
You can "return" the data to the hard drive of the programmer with what function? PLC -> Download PLC <- Upload PLC -> Save PLC <- Load
PLC <- Upload
offers a standard interface for transmission of mainly binary process data between an "interface module" in the (central) programmable controller and the field devices using Industrial Ethernet. PROFIBUS DP ASi (Actuator Sensor Interface) Device-Net PROFINET IO
PROFINET IO
The ______allows you to set the communications protocol and device used to connect the programmer to the controller. Network Settings Hardware Configuration Connections PG/PC Interface
Pg/ pc
The______ provides the internal supply voltage Rack CPU Signal Module Power Supply
Power supply
Which module of the PLC is responsible for performing logical operations? Power Supply Processor Input Output
Processor
What is the absolute address for an output at byte 2 and bit 1? M2.1 Q2.1 Q1.2 Q2.1
Q2.1
What would the Absolute Address be for an Output at Byte 4 and Bit 3? Q3.4 Q 14.3 i 3.4 Q4.3
Q4.3
When I/O is modular, it slots into the______ It connects to the backplane allowing the CPU to communicate with the modules. Carriage Rack or Chassis Widget Hole
Rack or Chassis
accommodate the modules and connect them to each other. Power Supplies Racks CPUs Input Modules
Racks
Which modules adapt the signals from the system to the internal signal level? Power Supply CPU Racks Signal Modules
Signal module
What type of module adapts the signals from field devices to the internal signal level? System Modules Settings Modules Slow Modules Signal Modules
Signal modules
What is the function of a PLC input interface module To provide power to the field devices. To evaluate signals from field devices. To accept signals from the field devices and convert them into signals that can be used by the controller. All of these
To accept signals from the field devices and convert the into signals that can be used by the controller.
What is the function of a PLC output interface module? All of these. To evaluate output signals. To provide power to field devices. To convert controller signals into external signals used to control a machine process
To convert controller signals into external signals used to control a machine process
Output modules commonly contain______,_____or_______to conduct switching for the output terminal.
Triacs | Relays | Transistors
You can "return" the data to the hard disk of your programming device with which step? Modify Download Monitor Upload
Upload
In S7-300 CPUs, is the MMC required to operate theunit? Yes It depends on the the model. No. Sometimes.
Yes
Field or real-world devices refer to? all devices that are physically wired to the PLC input devices only output devices only
all devices that are physically wired to the PLC
Inputs and Outputs (I/O) are integrated into the PLC in either______ modular configurations fixed or modular configurations fixed configurations
fixed or modular configurations
What is the absolute address for an input wired to the first card and terminal? Assume the allocation of memory has not been altered from the default. i 1.0 M 0.1 Q0.0 i 0.0
i 0.0
The diagram shown is a______ ladder logic program output module wiring input module wiring relay schematic
input module wiring
In PC-based control systems, a(n)____ is required to interface with input and output field devices. input/output PC interface card adapter cable ethernet port serial cable
input/output PC interface card
Picture The diagram shown is that of a______ output module relay schematic ladder logic program input module wiring diagram
ladder logic program
[Petruzella] The output interface module connects to_____ load devices such as lamps or solenoids programming device such as a computer sensing devices such as switches or pushbuttons All of these
load devices such as lamps or solenoids
The central processing unit (CPU)_______ looks at the inputs, makes the decisions based on the program, and sets the outputs serves only to store the program in memory serves only to supply power to the backplane
looks at the inputs, makes the decisions based on the program, and sets the outputs
Basically, the function of a PLC is to control a high voltage output with a low voltage input make logical decisions and control outputs based on them amplify various weak signal sources
make logical decisions and control outputs based on them
Programmable Logic Controllers are categorized according to the______ number of 1/O points current rating of I/O modules cost of the 1/O modules
number of 1/O points
[Petruzella] The main difference between a PLC and relay control systems is that ______. A)Different types of input devices are used B)Different types of output devices are used C) one uses hardwired relay control logic and the other uses programmed instructions D) different input and output voltage levels are used
one uses hardwired relay control logic and the other uses programmed instructions
A(n)_____ architecture design allows the system to bi easily connected to devices and programs from other manufacturers. A(n)____ architecture makes connecting devices from different manufacturers challenging. proprietary open gothic modern closed open open proprietary
open proprietary
An 1/0 module can be divided into the_____ and ____ section signal | logic power | logic electromechanical | solid-state power | signal
power | logic
A_____contains everything needed to run a process,whereas a_____corresponds to a programmable controller project/station program/ block project /block station/ program
project station
PLCs were originally designed as replacements for relay control panels microcomputers digital controllers
relay control panels
At the start of the PLC scan the_____ status of all inputs are read diagnostics and communications tasks are executed status of all outputs are updated
status of all inputs are read
[Petruzella] The PLC power supply module normally is rated to provide power for the PLC backplane and 1/0 modules input field devices only all field devices output field devices only
the PLC backplane and 1/0 modules
In order to energize the starter coil_______ Picture
the pressure switch and the temperature switch or the manual pushbutton must be closed
Which of the following input devices are not typicall, discrete devices? pushbuttons switches thermocouples limit switches
thermocouples
The scan time is the time required to record the status of all input devices to record the status of all output devices to execute one cycle of the total program
to execute one cycle of the total program
The symbol in aladder logic diagram represents a_______ set of normally closed contacts field input sensing device virtual relay coil
virtual relay coil
The programming device must be connected to the controller when monitoring a program only when entering a program at all times when entering, modifying, or monitoring a program
when entering, modifying, or monitoring a program
______ are software-level locations used for up and down counting.
Counters
The ______list shows the use of the addresses and blocks in the user program. It includes the absolute address, the symbol (if any), the block in which the address was used, how it was used (read or write), and the positions of use of the address. Cross-References Assignments Program Structure Addresses without Symbols
Cross-References
_____are used to scan the signal states of momentar contact switches an limit switches. Discrete Input Modules All of these. Discrete Output Modules Analog Input Modules
Discrete Input Modules
_____are used to control contactors and lamps. Interface Modules All of these. Analog Output Modules Discrete Output Modules
Discrete Output Modules
After compiling, you can transfer the configuration data to a CPU with which step? Monitor Upload Download Modify
Download
Why do most PLC modules use plug-in wiring terminal strips? Ease of wiring and the ability to easily replace modules. Ability to easily replace modules. Allowance for changing the type of module installed
Ease of wiring and the ability to easily replace modules.
T or F For digital modules, 2 bytes are allocated for each module.
F
T or F The Micro Memory Card in the S7-300 CPU is not required for operation.
F
T or F The maximum number of bodes on the MPI network is 127.
F
What is the purpose of the optocoupler or optoisolator circuit in an input/output module? It provides electrical isolation between modules. It provides isolation between the module and the backplane. It provides electrical isolation between field wiring and the PLC's internal circuitry.
It provides electrical isolation between field wiring and the PLC's internal circuitry.
What is the function of a power supply?
It provides the power to the CPU and the internal circuitry of connected modules.
For creating the user program, the STEP 7 Basic Package contains a program editor for the and programming languages. ST I SCLISTL LAD | FBD | SCL LAD | FBD | ST LAD | FBD | STL
LAD | FBD | STL
Which of the programming languages below is the most common (often considered standard) language used in PLC?
Ladder logic
What are the two most common types of PLC programming devices? Handheld Programmers and Integrated Displays/Controls Laptop and Personal Computers Flash Memory Devices and Handheld Programmers Handheld Programmers and Laptop Computers
Laptop and Personal Computers
A control management PLC application normally requires a______ micro-size PLC large-size PLC small-size PLC
Large
______ are part of the SIMATIC manager software used for storing reusable program components, such as user programs, source programs, or symbol tables. Sources Project Libraries Programs
Libraries
In newer 57-300 CPUs, the_____is a non-volatile memory device that stores the user program and acts as the load memory of the PLC. MM (Memory Module) IM (Internal Memorv) MMC (Micro Memory Card) MC (Memory Card)
MMC
A____is a connection between several devices for communication.
Network
[Berger]A _____ is a connection between several devices for the purpose of communication. Database Rung CPU Network
Network
In S7-300 stations that are single-tier, which slot remains empty and is reserved for the Interface Module (IM) to the expansion rack? Slot 2 Slot 0 Slot 4 Slot 3
Slot 3
The _____ is a table where you can assign an alphanumeric name to an absolute address and then access it using the assigned name. Assignment Table Program Structure Tag Table Symbol Table
Symbol Table
In this window, you can assign an alphanumeric name to an address and then access it with this name. Symbol Editor VAT Table Program Editor
Symbol editor
[Berger] are locations used as dynamic intermediate buffers during block processing and are located in the L stack, which the CPU occupies dynamically during program execution. Temporary Local Data Global Data Shared Data System Data
Temporary Local Data
Picture The symbol in aladder logic diagram represents a capacitor is always logic level O can be thought of as a normally open contact is always logic level 1
can be thought of as a normally open contact
Modifying relay-type process control circuits usually involves changing the_____ circuit wiring output circuit modules input circuit modules circuit operating voltage levels
circuit wiring
