ABB PM151 3BSE003642R1 process control system

Description

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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