Page Contents

## What is discrete voltage?

Discrete signals are signals that are either on or off, true or false. Think of a light switch in your house. There are a variety of discrete end devices and modules that can be used in a PLC system to send and receive on/off signals. These devices can be AC or DC and are available in different voltage ranges.

## What is difference between digital and discrete?

A discrete time signal which is not quantized can take any value in the given range (i.e. infinite options for the amplitude) where as a digital signal can take any value from a predefined finite set of amplitudes. The digital signal can take any value out of these N values only ( and not just any value).

## What is meant by discrete signal?

A discrete signal or discrete-time signal is a time series consisting of a sequence of quantities. Unlike a continuous-time signal, a discrete-time signal is not a function of a continuous argument; however, it may have been obtained by sampling from a continuous-time signal.

## What’s the difference between analog and discrete?

The difference between Analog and Discrete When used as adjectives, analog means in which the value of a data item (such as time) is represented by a continuous(ly) variable physical quantity that can be measured (such as the shadow of a sundial), whereas discrete means separate.

## What is discrete input and output?

A digital signal that senses or sends either ON or OFF signals. For example, a discrete input would sense the position of a switch; a discrete output would turn on a pump or light.

## What is a discrete I O module?

The Discrete I/O module is a simple interface between a CiA CANopen ® network and discrete electronic devices in a genset or industrial environment. It can translate voltage levels on the inputs to a bit in a TPDO data byte.

## Are all discrete signals digital?

Analog signals use a continuous variety of amplitude values whereas digital signal takes a limited set of distinct values at consistently spaced spots in the time. Analog signals are continuous in nature, whereas digital signals are discrete.

## Are all discrete time signals digital?

A digital signal, on the other hand, is a signal that only changes at discrete time instants ánd can take a discrete set of different values. So, all digital signals are discrete time signals; but not all discrete time signals are digital.

## Is Money discrete or continuous?

Because money comes, in clear steps of one cent, it’s a discrete variable, as well. In theory, the restaurant could make any amount of money. However, the revenue is still discrete. Because we can think of values that are not possible.

## Is age continuous or discrete?

Age is measured in units that, if precise enough, could be any number. Therefore the set they come from is infinite. For example, someone could be 22.32698457 years old or 22.32698459 years old. We could be infinitly accurate and use an infinite number of decimal places, therefore making age continuous.

## What is output of PLC?

Relay outputs are mechanical contacts and solid state outputs may take the form of transistor or TTL logic (DC) and triac (AC). Relay outputs are usually used to control up to 2 amps or when a very low resistance is required. Transistor outputs are open collector common emitter or emitter follower.

## What do you call two discrete voltage levels?

These two discrete voltage levels representing the digital values of “1’s” (one’s) and “0’s” (zero’s) are commonly called: BI nary digi TS, and in digital and computational circuits and applications they are normally referred to as binary BITS.

## How are voltage levels used in digital logic?

Digital logic circuitry makes use of discrete voltage levels: each “logic gate” sub-circuit inputs and outputs voltages that are either considered “high” or “low”. Define what both of these terms means in a digital logic circuit powered by 5 volts DC. “High” = (nearly) 5 volts between the gate input/output and ground.

## What kind of voltage does a digital circuit use?

Digital logic circuitry makes use of discrete voltage levels: each “logic gate” sub-circuit inputs and outputs voltages that are either considered “high” or “low”. Define what both of these terms means in a digital logic circuit powered by 5 volts DC.

## Is there a threshold voltage for logic gates?

That is, somewhere between the lowest “high” signal voltage level and the highest “low” signal voltage level guaranteed by the gate manufacturer, there is a threshold voltage at which the gate will actually switch its interpretation of a signal from “low” or “high” or vice versa.

Digital logic circuitry makes use of discrete voltage levels: each “logic gate” sub-circuit inputs and outputs voltages that are either considered “high” or “low”. Define what both of these terms means in a digital logic circuit powered by 5 volts DC. “High” = (nearly) 5 volts between the gate input/output and ground.

That is, somewhere between the lowest “high” signal voltage level and the highest “low” signal voltage level guaranteed by the gate manufacturer, there is a threshold voltage at which the gate will actually switch its interpretation of a signal from “low” or “high” or vice versa.

## Which is an example of a threshold voltage level?

For any logic family, there are a number of threshold voltage levels to know. Below is an example for standard 5V TTL levels: V OH — Minimum OUTPUT Voltage level a TTL device will provide for a HIGH signal. V IH — Minimum INPUT Voltage level to be considered a HIGH.

Digital logic circuitry makes use of discrete voltage levels: each “logic gate” sub-circuit inputs and outputs voltages that are either considered “high” or “low”. Define what both of these terms means in a digital logic circuit powered by 5 volts DC.