Satchwell IAC 600 - Look-up Table Module; Scaling Module

MODULES AND FUNCTIONS
Bubbleland
Symbol Module Range Default
MATHS MODULES
(
Cont.
)
ANALOGUE AVERAGING MODULE
x 6
This module re
q
uires no settin
g
and is used to avera
g
e up to 3 inputs.
The module supplies a maximum, minimum and avera
g
e output value.
COMPARATOR MODULE
x 8
The Comparator module is used to compare two analo
g
ue inputs and
g
ive two Di
g
ital outputs if certain conditions are true. If the inputs are
referred to as A and B then the re
q
uired conditions are:-
A
≥
B then output 1 is on
A = B ‘+ or
−∋
the set tolerance then output 2 is on
Tolerance
A tolerance can be set for the A = B output such that the condition will
tri
gg
er when A = B ‘+ or –’ the tolerance
0 to 10,000 1
LIMITER MODULE
x 8
The Limiter module is used to limit the ran
g
e of an Analo
g
ue si
g
nal.
The upper and lower limits can be set either from within the module or
b
y
feedin
g
an analo
g
ue si
g
nal into the two analo
g
ue inputs. The value
of these inputs sets the correspondin
g
upper and lower limits. Di
g
ital
inputs on the module override the module output to the upper or lower
set limit respectivel
y
.
Minimum Value
–10,000 to 10,000 0
Maximum Value
–10,000 to 10,000 100
LOOK-UP TABLE MODULE
x 6
The Look-up Table module is used to scale an
y
analo
g
ue si
g
nal to a
set of units, for instance pressure. The input and correspondin
g
output
value can be entered.
Input Value 1 and Output Value 1
There are eleven of these pairs to allow for non linear sensor
characteristics. If all eleven pairs are not re
q
uired unused pairs are set
to - - -.
NOTE:-
The ‘IN’ value must increase in size from input value 1 upto
input value 11 for the look-up table to function correctl
y
.
–10,000 to 10,000 IN OUT
00
10 2
20 3
30 4
40 6
50 10
60 16
70 25
80 40
90 63
100 100
SCALING MODULE
x 8
The Scalin
g
module is used to re-scale an analo
g
ue si
g
nal based on
minimum and maximum input and output values. From these values
the IAC scales all the points in between linearl
y
.
For example for values of 0 in 0 out and 50 in 100 out a 0 to 5 Volt
input is expanded to a 0 to 10 Volt output.
Si
g
nals can be reversed b
y
usin
g
this module b
y
settin
g
, for example
0, 100 and 100, 0 this would reverse a 0 to 10Vdc input si
g
nal.
NOTE:-
The Input Minimum Value must be less than the Input
Maximum Value for the Scalin
g
Module to function correctl
y
.
Input Minimum Value
–10,000 to 10,000 0
Output Minimum Value
–10,000 to 10,000 0
Input Maximum Value
–10,000 to 10,000 100
Output Maximum Value
–10,000 to 10,000 100
THRESHOLD MODULE
x 8
The Threshold module is used to provide a switched output from an
analo
g
ue input. If both the on and off values are set the same the
module will act as a simple switch. If the off value is set below the on
value then the switch will have a h
y
steresis on it. The Off threshold
must be less than or e
q
ual to the On threshold.
On Threshold
–10,000 to 10,000 0
Off Threshold
–10,000 to 10,000 0
RATE LIMITING MODULE
x 6
This module allows an
y
var
y
in
g
analo
g
ue si
g
nal to be slowed down or
smoothed. The time
(
in seconds
)
and a value are set. The output
value will then follow the input as lon
g
as it chan
g
es at/or slower than
the set value per set time period. If it chan
g
es faster than the values
set then the output will chan
g
e onl
y
at the rate set. For example, the
module ma
y
be set at 5
°
C per 1 second, if the input chan
g
es b
y
10
°
C
in 1 second and stabilizes then the output will take two seconds to
e
q
ual the input.
DS 2.951A 4 - 24 05/98