Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 281)

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Document: 553633
ICSTT-RM405f-EN-P
Issue 07
12-7
Glossary of Terms
pinging
In Modbus communications, sending the
diagnostic Query Data command over a link
and by receiving a reply ensuring that the
link is healthy and the controller is able to
communicate with the master. No process
data is transferred or modified. In the case
of slave devices that will not support pinging
then the Standby command will default to
Inactive state, but no error will be returned.
portable equipment
Enclosed equipment that is moved while in
operation or which can easily be moved
from one place to another while connected
to the supply. Examples are programming
and debugging tools and test equipment.
process safety time (PST)
For equipment under control this
represents the period of time a dangerous
condition can exist without the protection
of a safety instrumented system before a
hazardous event occurs.
processor base unit
A backplane assembly which holds all of the
processor modules in an AADvance
controller. Part number 9100. See also
'processor module'.
processor module
The application execution engine of the
AADvance controller, housed in a self-
contained and standardized physical form
factor.
producer
A controller producing a tag to one or more
consumers, at the request of the consumers.
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
A collection of configurations and the
definition of the linking between them. See
'configuration'.
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
Process Safety Time
R
real
A class of analogue variable stored in a
floating, single-precision 32-bit format.
redundancy
The use of two or more devices, each
carrying out the same function, to improve
reliability or availability.
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-232-C, RS-422, RS-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
Real-time clock.