Rockwell-automation AADvance Controller System Build Manual de usuario descargar pdf (Pagina 125)

Document: 553632

(ICSTT-RM448_EN_P) Issue: 08:

8-7

Chapter 7 Glossary of Terms

processor module

processor moduleprocessor module

processor module

The application execution engine of the

AADvance controller, housed in a self-

contained and standardized physical form

factor.

producer

producerproducer

producer

A controller producing a tag to one or more

consumers, at the request of the consumers.

program enable key

program enable keyprogram enable key

program enable key

A security device that protects the

application from unauthorized access and

change, in the form factor of a 9-way 'D'

type plug. Part number 9906. Supplied with

the processor base unit. See also 'key

connector'.

project

projectproject

project

A collection of configurations and the

definition of the linking between them. See

'configuration'.

protocol

protocolprotocol

protocol

A set of rules that is used by devices (such

as AADvance controllers, serial devices and

engineering workstations) to communicate

with each other. The rules encompass

electrical parameters, data representation,

signalling, authentication, and error

detection. Examples include Modbus, TCP

and IP.

PST

PSTPST

PST

Process Safety Time

R

RR

R

real

realreal

real

A class of analogue variable stored in a

floating, single-precision 32-bit format.

redundancy

redundancyredundancy

redundancy

The use of two or more devices, each

carrying out the same function, to improve

reliability or availability.

resolution

resolutionresolution

resolution

The smallest interval measurable by an

instrument; the level of detail which may be

represented. For example, 12 bits can

distinguish between 4096 values.

RS

RSRS

RS-

--

-232

232232

232-

--

-C, RS

C, RSC, RS

C, RS-

--

-422, RS

422, RS422, RS

422, RS-

--

-485

485485

485

Standard interfaces introduced by the

Electronic Industries Alliance covering the

electrical connection between data

communication equipment. RS-232-C is the

most commonly used interface; RS-422 and

RS-485 allow for higher transmission rates

over increased distances.

RTC

RTCRTC

RTC

Real-time clock.

RTU

RTURTU

RTU

Remote terminal unit. The Modbus protocol

supported by the AADvance controller for

Modbus communications over serial links,

with the ability to multi-drop to multiple

slave devices.

S

SS

S

safe state

safe statesafe state

safe state

A state which enables the execution of a

process demand. Usually entered after the

detection of a fault condition; it makes sure

the effect of the fault is to enable rather

than disable a process demand.

safety accuracy

safety accuracysafety accuracy

safety accuracy

The accuracy of an analogue signal within

which the signal is guaranteed to be free of

dangerous faults. If the signal drifts outside

of this range, it is declared faulty.

safety

safetysafety

safety-

--

-critical state

critical statecritical state

critical state

A faulted state which prevents the

execution of a process demand.

sensor

sensorsensor

sensor

A device or combination of devices that

measure a process condition. Examples are

transmitters, transducers, process switches

and position switches.

sequential function chart

sequential function chartsequential function chart

sequential function chart

An IEC 61131 language that divides the

process cycle into a number of well-defined

steps separated by transitions. See 'limited

variability language'.

1 2 ... 120 121 122 123 124 125 126 127 128 129 130

Comentarios a estos manuales

Sin comentarios