Rockwell Automation AADvance Controller Troubleshooting and Maintenance Manual - Manual (Page 91)

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Document: 553634
(ICSTT-RM406F_EN_P) Issue: 089:
8-7
Chapter 7 Glossary of Terms
O
on-line
The state of a controller that is executing
the application software.
OPC
A series of standards specifications which
support open connectivity in industrial
automation.
output (Workbench variable)
In the context of an AADvance Workbench
variable, this term describes a quantity
passed from the Workbench to a controller.
P
peer to peer
A Peer to Peer network consists of one or
more Ethernet networks connecting
together a series of AAdvance and/or
Trusted controllers to enable application
data to be passed between them.
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.