ABB Advant Controller 450 Product Manual page 18

Advant Controller 450 Product Guide
Chapter 2 Functional Description
2-4
PC Elements
The wide range of ready-to-use PC elements is powerful. It contains, for example, elements for:
• Logic and Time Delays
• Sequence Control
• Data and Text Handling
• Calendar Time Functions
• Arithmetic
• Feedback Control
• Fuzzy Control
• Pulse counting and Frequency Measurement
• Positioning
• Reports
• Communication via Fieldbuses.
The PC elements are listed under the program modules in
User Defined PC Elements
Another way to implement your frequently used control solution and ensure a fully integrated
engineering environment is to use the optional program module User Defined PC Elements.
A user defined PC element appears in every sense as a standard PC element. Actually
the control solution of a user defined PC element is defined by other PC elements. By designing
your application with user defined PC elements you gain:
• Significant reduction in translation time
• Memory saving with reuse
• Similar documentation in Function Chart Builder and On-line Builder
• User defined PC element hierarchy
• Reduced man-hours in commissioning and maintenance.
Functional Units
A functional unit is a package of different functions, such as PC elements, DB elements, display
elements, dialogs and event and alarm handling. Functional units extend the power of AMPL
and supplement the PC element library for more complex control functions.
Since the functional units are ready-to-use, it simplifies documentation and implementation of
functions with both control function and associated operator's action via display screen and
keyboard. The operator interface is always consistent to improve the operator's interaction with
the process. Application include regulators, sequence control and motor/valve controls.
PC elements and functional units can be used freely together.
The functional units are listed under the program modules in
Chapter 3, Software Components.
Chapter 3, Software Components.
3BSE 015 953R201 Rev B