variable quantity

actual value

desired value

deviation

vector of variables

input variable

output variable

state variable

state space

trajectory

continuous-value variable

discrete-value variable

quantize, verb

binary variable

continuous-time variable

discrete-time variable

signal

information parameter

continuous-value signal

discrete-value signal

binary signal

continuous-time signal

discrete-time signal

analog signal

digital signal

sampled signal

white noise

aliasing

state equation

output equation

input matrix

output matrix

direct input-output matrix

system matrix

transition matrix

system

structure

system parameter

linear system

linearize, verb

characteristic equation

time-invariant system

multivariable system

distributed-parameter system

minimal-phase system

all-pass system

control

stability

asymptotic stability

controllability

observability

action

interface

model

algorithm

redundancy

manual, adj

automatic, adj

degree of automation

automaton

process, <in control technology>

technical process

plant

cybernetics

expert system

knowledge base

inference engine

measure, verb

count, verb

monitor, verb

indicate, verb

notify, verb

alert, verb

warn, verb

alarm, verb

record, verb

log, verb

archive, verb

manipulate, verb

evaluate, verb

optimize, verb

intervene, verb

safeguard, <equipment> verb

safeguard, <action> verb

lock, verb

structure, verb

configure, verb

parameterize, verb

automate, verb

acknowledge, verb

operate, verb

functional diagram

functional block

action path

action line

direction of action

summing point

branching point

serial structure

parallel structure

loop structure

principle of superposition

principle of shifting

transfer element

linear transfer element

time-invariant transfer element

distributed-parameter transfer element

identification of a system

transient behaviour

time response

steady state

characteristic curve

operating point

saturation

limitation

dead band

hysteresis

reset windup

damping

damping ratio

unit impulse

unit-step function

unit time ramp

impulse function

step function

ramp function

impulse response

step response

ramp response

unit-impulse response

unit-step response

unit-ramp response

time constant

impulse-function sequence

equivalent dead time

equivalent time constant

step response time

settling time

overshoot

transfer function

Z-transfer function

frequency response

gain

logarithmic gain

gain response

phase angle

phase response

frequency response characteristic

corner angular frequency

frequency response locus

describing function

rational transfer element

minimal-phase element

all-pass element

controlled system with self-regulation

controlled system without self-regulation

control rise time

control settling time

open-loop frequency response

gain crossover angular frequency

phase margin

phase crossover angular frequency

gain margin

control factor

Nichols plot

root-locus plot

phase plane analysis

reference-variable response of the control system

disturbance response of the control system

hunting

closed-loop control

open-loop control

closed action path

closed action

open action path

open action

forward path

feedback path

disturbance feedforward control

reference-variable feedforward control

control loop

control chain

continuous feedback control

multi-position control

sampling control

sampling period

fixed set-point control

time scheduled closed-loop control

follow-up control

programmed control

hardwired programmed logic control

storage-programmable logic control

non-clocked control

clocked control

cascade control

secondary control

ratio control

state-feedback control

output-feedback control

distributed feedback control

observer

observer-based control

model-based control

modal control

multivariable control

integrity of a multiloop control system

decoupling

centralized control

decentralized control

hierarchical control

optimal control

adaptive control

parameter identification

parameter sensitivity

robust control

disturbance estimation

prediction

limiting control

alternative control

split-range control

switching control

computer control

time-shared control

position algorithm

velocity algorithm

fuzzy control

membership function

rule-based control

sequential control

process-oriented sequential control

time-oriented sequential control

reset circuit

pole assignment

controlled variable

reference variable

feedback variable

control difference variable

steady-state control difference variable

controller output variable

manipulated variable

disturbance variable

command variable

final controlled variable

measuring range

measuring span

range of the controlled variable

range of the reference variable

range of the final controlled variable

range of the manipulated variable

manipulating time

range of the disturbance variable

controlled system

controlling system

comparing element

controlling element

measuring element in control technology

control system

actuator

final controlling element

final controlling equipment

reference-variable generating element

controller for closed-loop control

lag element

first-order lag element

second-order lag element

lead-lag element

proportional element

proportional action coefficient

proportional band of a controlling element

integral element

integral action coefficient

integral action time

proportional plus integral element

reset time

derivative element

derivative action coefficient

derivative action time

proportional plus derivative element

rate time

derivative action gain

proportional plus integral plus derivative element

multi-position element

two-position element

on-off element

three-position element

switching value

differential gap

neutral zone

limit monitor

sampling element

holding element

dead time

dead-time element

adding element

multiplying element

dividing element

function generator

square-root element

squaring element

absolute-value element

sign element

storage element

checkback signal

enabling signal

interlock signal

command in a function chart

stored command

conditional command

delayed command

time-limited command

waiting time

check time

switching system

switching element

combinatorial circuit

sequential circuit

binary-logic element

bistable element

dynamic input in switching systems

triggered bistable element

monostable multivibrator

binary delay element

register

counter

switching function

state transition table

transition function

output function

switching table

state graph

Boolean operation

function chart for sequential control

step

transition

transition condition

sequence chain

beginning of sequence selection

end of sequence selection

beginning of simultaneous sequences

end of simultaneous sequences

process computer system

compact process computer system

distributed process computer system

redundant process computer system

process interface

real-time capability

interrupt capability

restart capability

real-time operating system

process monitoring system

process peripherals

analog output unit

digital output unit

analog input unit

digital input unit

timer

interrupt input unit

interrupt reaction time

input transfer rate

output transfer rate

operating mode

manual operation

automatic operation

semi-automatic operation

step-setting operation

time program

priority

control structure

centralized control structure

decentralized control structure

hierarchical control structure

control level

individual control level

group control level

plant control level

process control function

item under consideration

functional unit

physical unit

signal generator

filter element

adjuster

control device

time scheduler

clock generator

bus

ring

star

mesh

protocol

linking element

actuating drive

positioner

indicating element

output element

decoupled output

conditions of operation, pl

active fault in control equipment

passive fault in control equipment

control equipment

programmable controller

sensing element

transducing element

measuring transducer

measuring transmitter

transformer

barrier

amplifier

operational amplifier

magnetic amplifier

converter

analog-to-digital converter

digital-to-analog converter

serial-to-parallel converter

parallel-to-serial converter

hazard

harm

risk

tolerable risk

safety

functional safety

security