ABB Advant Controller 450 User Manual

Advant
®
Controller 450 User’s Guide
Chapter 4 Runtime Operation
4-20 3BSE 002 415R701 Rev A
4.1.9.2 Data Area for PC Programs
Each PC program is provided with a local data area for storage of variable values.
4.1.9.3 PC Program
You can divide a control task into a number of functional sections. The division is performed
primarily in accordance with the functional structure of the control task and can also be in
accordance with the requirement of different cycle times in the process. A PC program can
accordingly be divided into function modules and several execution units, which in turn consist
of PC elements.
Each execution unit can be given its own periodicity and its own execution conditions for
connection and disconnection.
PC elements are the smallest “building blocks” in a PC program. They are described in detail in
the manual PC Elements. As an example, Figure 4-12 shows the graphical symbol for the PC
element FUNG-1V, a function generator. The figure also gives a rough outline of the supporting
elements for the break-points of the desired function (curve).
Figure 4-13 shows the desired application function.
Figure 4-12. Example of PC Element: FUNG-1V
FUNG-1V
(C1)
X
BAL
BALREF
XTAB
YTAB
Y
ERR
BALREFO
REG-G
REG-G
1
2
3
4
5
10
11
12

ABB Advant Controller 450 Specifications

General

Brand	ABB
Model	Advant Controller 450
Category	Controller
Language	English