ABB Advant Controller 450 User Manual

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All global objects are identified (and accessed) by unique names which you define within an
application project. Certain objects are given default names by the system, which you can
change later. From the system’s point of view, the name structure is flat. However, since a name
is a visible ASCII string, you can implement any kind of structure in naming objects.
Names are introduced in a controller via data base elements representing the actual object.
In general, the designation (connection NAME) on the data base element must be unique in the
controller. Designations referred to from an operator station via a Control Network must also be
unique in the total process control system connected to that network.
When defining signals, it is important that the signals be given names which are well considered
and will not have to be changed at some later stage.
With auto-generation of a PC-diagram, the signal names are printed in the diagram. This is the
reason for providing the signals with plain language names, even with a stand-alone controller.
The philosophy behind the naming of the signals is to also be applicable to calculated signals.
As an example, the values provided by two level transducers are averaged to give a calculated
signal. The physical signals are named LT 104A and LT 104B and the calculated signal is
named LT 104.
The designation philosophy for objects in the process control system must be established when
the signals are named. (Following relevant standards.) The designations should preferably be
hierarchic so that objects and signals are given associative names.
A feedback control loop for level control named LICA 104 (LICA = Level Indication Control
Alarm) is an example.
The PID controller object is assigned the name LICA 104 while the actual value (the feedback
signal) is suitably designated LT 104 (LT = Level Transmitter) and the controller output value
LV 104 (LV = Level Valve). These names are obtained from one of the standards for
designations in process industries, ISO 3511.
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PID controller
LICA 104
AO
AI
LT 104
LV 104
LV 104
Level
transmitter
LT 104
Control
valve
Feedback control loop LICA 104
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ABB Advant Controller 450 Specifications

General

Brand	ABB
Model	Advant Controller 450
Category	Controller
Language	English