Student name answer key student number section obtained c. Mcqs on input and output devices gk objective question answer exam question answer for competitive exam of govt jobs. Discrete, or digital, input devices simply provide onoff information. This means at least two terminals are associated with every io point. Discrete pid controller on tinyavr and megaavr devices. Discrete inputoutput system philadelphia university. Ppt input and output devices powerpoint presentation. This means it is possible to connect the external supply and field device to the io point, with current trying to flow in the wrong direction, and the circuit. Input output devices are required for users to communicate with the computer. Discrete inputoutput second order sliding mode control. They receive their operating power from the plcs power supply.
Pdf on mar 1, 2015, romdhane houda and others published discrete inputoutput second order sliding mode control using lmis approach find, read and cite all the research you need on researchgate. A rack recognizes the type of module connected to it input or output and the class of interface discrete, analog, numerical, etc. Joysticks are often used to control video games, and usually have one or more pushbuttons whose state can also be read by the computer. Each field device input screw terminal will correlate to a. Plc digital input and digital output modules plc hardware. Plc discrete digital output control ina240 is a high precision, bidirectional current sense amplifier with low input offset and gain drift across temperature range making it an ideal device for measuring currents on discrete plc digital outputs. In a manner similar to discrete inputs, a plc connects to any number of different discrete final control devices through a discrete output channel note1. In this lecture we will discuss the various input and output devices that are used in 3d. Choice and method of use of an input device should contribute positively to usability of the system. In a plc i is used for output and q is used for input a. Touch screens are often used for information kiosks located in.
Discrete output modules typically use the same form of optoisolation to allow the plcs computer circuitry to send electrical power to loads. Most allenbradley plcspacs must use a thirdparty module or gateway device to communicate via modbus. Discrete pid controller on tinyavr and megaavr devices application note introduction this application note describes a simple implementation of a discrete. Inputoutput devices and interaction techniques ken hinckley, microsoft research robert j. Iocs provides functionality similar to file control processor fcp 1 in rca 3301 realcom operating system and gefrc 2 in gecos. The powercommand aux 101 inputoutput module and the aux 102 inputoutput expansion module provide up to sixteen 16 relay output and up to twelve 12 discreteanalog inputs for auxiliary control and monitoring of the power system. Iocs provides functionality similar to file control processor fcp in rca 3301 realcom operating system and gefrc in gecos computers in the 1950s and 1960s typically dealt with data that were organized into records. In addition, there can be pulse output when the device is active. D indicates number of output points per module and designates current sinking, current sourcing, or either.
Safety and protection for discrete digital outputs in a. Input and output devices 1 input and output devices 2 io devices input. Number of commons per module and their electrical characteristics. Contactors, motor starters, valves, and other output devices are used to turn onoff motors, lights, heating elements, and other equipment that affects the system in some way. Actions and reactions input sensors and status devices react to changes in conditions. Jacob, tufts university colin ware, university of new hampshire introduction the computing literature often draws a sharp distinction between input and output. External devices are not connected directly to the system bus because they have a wide range of control logics, as well as data transfer speeds and formats. Discrete devices discrete devices are input or output devices that provide or receive discrete digital signals. The maq20dioh discrete inputoutput module has 4 isolated discrete inputs and 4 isolated discrete outputs. Ppt input and output devices powerpoint presentation free.
Discrete control is implemented via two principle industrial controllers. Control discrete 4 with free desktop and mobile apps the free to download discrete 4 remote app allows you to adjust all microphone input levels. The user program determines how output devices work based on the state of input devices. Plc discrete input and output devices power supply. An output module controls devices such as relays, motor starters, lights, etc.
Discrete output modules discrete output modules 73 discrete output modules dl305 user manual, rev. Conditions include internal load, outside air temperature, and output. Control systemsdigital and analog wikibooks, open books. Stephanemallat, in a wavelet tour of signal processing third edition, 2009. Industrial communications devices read and write analog or discrete values from and to other plcs devices without the need for hardwiring every single input and output point between the plcs devices. In a manner similar to discrete inputs, a plc connects to any number of different discrete final control devices through a discrete output channel.
For example, a ccd camera filters the light intensity by the optics and each photoreceptor averages the input light over its support. Digital output exists when a voltage is applied to a pair of digital output leads. Thus, a computer must have a system to receive information from the outside world and must be able to communicate results to the external world. Analog discrete inputs can be used for system fault expansion and or generator set metering. Input devices, output devices automation element14. These devices can be ac or dc and are available in different voltage ranges. Every discrete input and output device gets power from separate supply systems.
Power output point switches to control field devices are provided by the user. Io devices are connected to the input and output sections of the plc. Discrete output modules discrete output modules send control signals to devices such as contactors, indicator lamps, and interposing relays that can also have. There are several standard voltages and types of output signals. A signal is called discrete time if it is only defined for particular points in time.
Since the boom is physically attached to a large stand, the users movement is limited. The user program and the state of io devices are stored in the internal memory of the plc. Discrete output modules discrete output modules send control signals to devices such as contactors, indicator lamps, and interposing relays that can also have two states. Relay output applicable for iolan sds1 d2r2 or a4r2 relay output exists when contacts are. Mechatronics control devices august 2004 page 2 introduction to understand how servo and control devices work, we need to think about the machines or processes they regulate. The inputoutput system 384k pdf file thelearningpit. Typically, binary values are input and output signals to and from the controller. Discrete output modules are simply switching devices that carry out commands from the processor. Commonly encountered examples include the presence of digital sensors and actuators or of finite capacity communication links in the control loop.
Now a day computer is one of the most important field for every examinations. As these voltages can be of different ratings or categories, so input and output elements have ability to work on the different alternating current and direct current voltage levels. Discrete output modules discrete output modules 78 discrete output modules dl305 user manual, rev. The following image shows the difference between an analog waveform and the sampled discrete time equivalent. The field devices that a plc output module will need to control may differ in their voltage requirements. Discrete state control the level is certainly not going to change until, at some later time, the output valve is opened to let the liquid flow out. Inputoutput devices and interaction department of computer.
So dear reader i have provided top expected gk questions from input and output device of computer. Notice that the variables level measurement, input valve setting, and output valve setting are twostate quantities. Following are few of the important output devices which are used in a computer. Powercommand inputoutput expansion module aux 101 and aux 102. Devices input and output unit 4 input output devices. These parameters and variables are typically binary i. Discrete vs analog io for plcs whats the difference. It forms images from tiny dots, called pixels that are. Virtually all external devices have buffers, control signals, status signals, and data bits. In the figure to the right, the input or output terminal is the main path for the current. Input and output devices 3 lecture outline output devices visual displays audio output tactile and haptic output input devices discrete event devices continuous event devices combination devices speech input. Input channels accept 360vdc signals and output channels switch 360vdc signals at up to 3a load. Complete the following diagram that shows the elements of a control system. Power output point switches to control field devices are.
Discrete control is employed for processes involving only discrete inputs and discrete outputs and their associated instrumentation devices. Sequencing this uses internal timing devices to determine when to initiate changes in output variables. This module recognition is decoded on the back plane i. Pressure switch connected to terminal screw 2 of the module in slot 3 of the chassis. Conceptually, a system can be viewed as a black box which takes in an input signal xt or xn and as.
Student name answer key student number section obtained. Analogdiscrete inputs can be used for system fault expansion andor generator set metering. Sinking and sourcing for the plc explained library. Microphone is an input device to input sound that is then stored in digital form. Discretestate control the level is certainly not going to change until, at some later time, the output valve is opened to let the liquid flow out. An input device one that, together with appropriate software, transforms information from the user into data that the computer application can process. Discrete output channels have user configurable default output states which are. These input output devices are also known as peripherals since they surround the cpu and memory of a computer system. A limit switch is an example of a discrete input device because, at any given time, it is either open or closed. Most often the discrete input signal bn is obtained by a finiteresolution device that averages and samples an analog input signal.
Examples of digital discrete input devices dry or wet contact type. The maq20dioh discrete input output module has 4 isolated discrete inputs and 4 isolated discrete outputs. Out1a and out1b without a load device in series such as an optoisolated input, relay, buzzer, lamp, etc. Figure 22 analog controller discrete component technology. Safety and protection for discrete digital outputs in a plc. Limit switch connected to terminal screw 4 of the module in slot 1 of the chassis. Like input devices, both discrete and analog output devices are available. Monitors graphic plotter printer monitors monitors, commonly called as visual display unit vdu, are the main output device of a computer. The maq20diol discrete input output module has 5 isolated discrete input channels and 5 isolated discrete output channels. Discrete output modules read the desired output state from the plc output scan and converts that logical status offon into the correct real world electrical signal. Getting started io wiring and specifications 3 5 io wiring and specifications in order for an io circuit to operate, current must enter at one terminal and exit at another. Discrete output takes a binary setpoint and writes it to a specified io channel to produce an output signal.
Remote io, otherwise called distributed io, refers to electronic devices that use. There are a variety of discrete end devices and modules that can be used in a plc system to send and receive onoff signals. Input and output points that are sinking or sourcing can conduct current in one direction only. The ina240 is specifically designed to work in switched node environments where the. Input and output devices 3 lecture outline output devices visual displays audio output tactile and haptic output input devices discrete event devices continuous event devices combination devices speech input the first part of the lecture will describe a number of output devices that stimulate the. Performs momentary or maintained switching for startstop of pumps, fans, twoposition dampers, and onoff control. Input channels accept 90280vacvdc signals and output channels switch 24280vac signals at up to 3a ac load. The maq20diol discrete inputoutput module has 5 isolated discrete input channels and 5 isolated discrete output channels. Nov 18, 20 discrete output modules read the desired output state from the plc output scan and converts that logical status offon into the correct real world electrical signal. Mcq input and output device of computer with answers pdf. A joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling. Plc discrete input and output devices the engineering.
Used to turn realworld output deices either on or off can be used to control any two state device available in ac and dc versions available in various voltage ranges and current capabilities examples of discrete devices controlled by plcexamples of discrete devices controlled by plc. Examples of io devices ethernet io perle perle systems. Chapter 2 discretestate control part i instrumentation. A discrete digital signal is one that can report only two states, such as onoff or openclosed. Simple discreet setodifferential precision inamp circuit. This documentation is a reference for the discrete and analog io hardware of the quantum automation system with ecostruxure control expert. Relay output applicable for iolan sds1 d2r2 or a4r2 relay output exists when contacts are closed on a pair of relay leads. Discrete isolation from gradientgoverned elimination of resonances.
A programmable logic controller plc accepts inputs from a variety of devices such as switches, sensors etc. Discrete io the most common type of plc io is discrete io. These devices are limited to relatively primitive devices like buttons, switches and levers. Inputoutput control system iocs is any of several packages on early ibm entrylevel and mainframe computers that provided low level access to records on peripheral equipment.
A discrete time system takes discrete time input signals, and produces discrete time output signals. Discrete devices are input or output devices that provide or. Solved assign each of the following discrete input and. Conceptually, a system can be viewed as a black box which takes in an input signal xt or xn and as a result generates an output signal yt or yn. In older control rooms, discrete control input devices that is, devices that depend upon mechanical motion are still the most common means for the operator to interact with the plants systems. In simple terms, input devices bring information into the computer and output devices bring information out of a computer system. Plc basic sensors and input devices a beginners guide. It forms images from tiny dots, called pixels that are arranged in a rectangular form. Therefore, sinking and sourcing terminology applies only to dc input and output circuits. Powercommand inputoutput expansion module aux 101 and. Continuoustime and discretetime systems physically, a system is an interconnection of components, devices, etc. The microphone is used for various applications like adding sound to a multimedia presentation or for mixing music. The powercommand aux 101 input output module and the aux 102 input output expansion module provide up to sixteen 16 relay output and up to twelve 12 discrete analog inputs for auxiliary control and monitoring of the power system.
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