control theory, a process variable (PV; also process value or process parameter) is the current measured value of a particular part of a process which is being...

environment variable is a user-definable value that can affect the way running processes will behave on a computer. Environment variables are part of...

target value (setpoint or SP) with the actual value of the system (process variable or PV). The difference between these two values is called the error...

process necessary to automatically adjust the value of a measured process variable (PV) to equal the value of a desired set-point (SP). There are two...

sensors continuously measure various process variables (such as temperature, pressure, etc.) and product quality variables. A programmable logic controller...

to automatically control a process or operation. The control system compares the value or status of the process variable (PV) being controlled with the...

thermodynamic process. The equilibrium states are each respectively fully specified by a suitable set of thermodynamic state variables, that depend only...

as a child process of the command shell or program that issued the command. On DOS, OS/2, and Windows operating systems, the %PATH% variable is specified...

process variable (PV), and compares it with the reference or set point (SP). The difference between actual and desired value of the process variable,...

detrimentally affect the process variable, and interaction from other loops in the network provides disturbances that influence the process variable. To reduce the...

process variable (PV), and compares it with the reference or set point (SP). The difference between actual and desired value of the process variable,...

essential variable, or process value (PV) of a control system, which may differ from the actual measured value of the variable. Departure of such a variable from...

a quantitative variable may be continuous or discrete. If it can take on two real values and all the values between them, the variable is continuous in...

action from the controller is independent of the "process output" (or "controlled process variable"). A good example of this is a central heating boiler...

stochastic (/stəˈkæstɪk/) or random process is a mathematical object usually defined as a family of random variables in a probability space, where the index...

Critical process parameters (CPP) in pharmaceutical manufacturing are key variables affecting the production process. CPPs are attributes that are monitored...

action ("input" to the system) is independent of the "process output", which is the process variable that is being controlled. It does not use feedback to...

engineering and process control, is a type of linear feedback control system in which a correction is applied to the controlled variable, and the size of...

dependent variables of the modeled system that will be caused by changes in the independent variables. In a chemical process, independent variables that can...

sensor is used to capture a process variable. The process variable is sent to a transmitter which translates the variable to the controller. The controller...

feedback for producing a control signal to maintain the controlled process variable (PV) at the desired setpoint (SP). There are several types of linear...

Variable valve timing (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, and is often used to improve...

In computer programming, a global variable is a variable with global scope, meaning that it is visible (hence accessible) throughout the program, unless...

A random variable (also called random quantity, aleatory variable, or stochastic variable) is a mathematical formalization of a quantity or object which...

Plasma arc welding (PAW) is an arc welding process similar to gas tungsten arc welding (GTAW). The electric arc is formed between an electrode (which...

explain the mechanism or process that underlies an observed relationship between an independent variable and a dependent variable via the inclusion of a...

probability theory and statistics, a Gaussian process is a stochastic process (a collection of random variables indexed by time or space), such that every...

In computer programming, a variable-length array (VLA), also called variable-sized or runtime-sized, is an array data structure whose length is determined...

integration: disabling the integral function until the to-be-controlled process variable (PV) has entered the controllable region Preventing the integral term...

In the mathematical theory of stochastic processes, variable-order Markov (VOM) models are an important class of models that extend the well known Markov...