Rockwell Automation ics triplex AADvance, System Build Manual

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Document: 553632
(ICSTT-RM448_EN_P) Issue: 08:
8-7
Chapter 7 Glossary of Terms
processor module processor module processor module processor module
The application execution engine of the
AADvance controller, housed in a self-
contained and standardized physical form
factor.
producer producer producer producer
A controller producing a tag to one or more
consumers, at the request of the consumers.
program enable key
program enable key program 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 project project project
A collection of configurations and the
definition of the linking between them. See
'configuration'.
protocol
protocol protocol
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 PST PST PST
Process Safety Time
R R R R
real
real real
real
A class of analogue variable stored in a
floating, single-precision 32-bit format.
redundancy
redundancy redundancy
redundancy
The use of two or more devices, each
carrying out the same function, to improve
reliability or availability.
resolution resolution resolution 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 RS RS RS----232 232 232 232----C, RS C, RS C, RS C, RS----422, RS 422, RS 422, RS 422, RS----485 485 485 485
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 RTC RTC RTC
Real-time clock.
RTU RTU RTU 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
S S
S
safe state safe state safe 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 accuracy safety 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 safety safety safety----critical state critical state critical state critical state
A faulted state which prevents the
execution of a process demand.
sensor
sensor sensor
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 chart sequential 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'.