Function Blocks - ABB DCS 500B Description

Functional Software description

Function Blocks

4
DCS 500B control program is made completely by function blocks.
The program can be modified with the control panel CDP312 or a
PC-based tool program CMT/DCS500B. Every function block, used
in the control program, has a structure similar to the one shown in
figure 4. Additional function blocks exist in every converter. They
can be used in the same way as the ones, shown in this document.
For more information, please see the APPLICATION BLOCKS
manual.
If additional function blocks are used, the converter should be la-
beled with a sticker indicating the type of application by any code or
plain text.
SP=Standard Program
Name of the Function Block
Function block input
(pin number; group 19
parameter 18)
Function block
P1 5000
parameter
P2 -5000
Parameter value
(display in "integer")
Figure 4 Structure of a Standard Program Function Block
All function block inputs characterized by a 3 or 4 digit number with
no Px box (Px box displays values either in integer, relative or
physical; see below) on the left hand side can be connected to a
function block output. Inputs can only be connected to each other
via a function block output (see next figure). Connections will be
made by selecting the input and using the number of the output as
a "parameter" value. Connecting more than one output to one input
is not allowed!
All the values shown within the Px boxes within this document are
given in Integer (micro processor) values. The scaling is according
to the PARAMETER LIST. Using the CMT/DCS500 PC tool, the
display can be altered between Integer, Relative (e.g. 78%) and
Physical (1432 rpm). The CDP 312 panel will always show physical
numbers.
SP
SOFTPOT
11904
1918
OUT
[INCR]
11905
1919
ACT
[DECR]
1920
[FOLLOW]
1921
OHL
1922
OLL
T20
DCS 500 Software Description
Function block output
number
Function block output
Function block output name
Signal name
Parameter name
Execution interval as ms