Satchwell IAC 600, Manual

Page: 4 / 24

MODULES AND FUNCTIONS
Bubbleland
Symbol
Module Range Default
MATHS MODULES
(Cont.)
ANALOGUE AVERAGING MODULE
x 6
This module requires no setting and is used to average up to 3 inputs.
The module supplies a maximum, minimum and average output value.
COMPARATOR MODULE
x 8
The Comparator module is used to compare two analogue inputs and
give two Digital outputs if certain conditions are true. If the inputs are
referred to as A and B then the required 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
trigger when A = B ‘+ or –’ the tolerance
0 to 10,000 1
LIMITER MODULE
x 8
The Limiter module is used to limit the range of an Analogue signal.
The upper and lower limits can be set either from within the module or
by feeding an analogue signal into the two analogue inputs. The value
of these inputs sets the corresponding upper and lower limits. Digital
inputs on the module override the module output to the upper or lower
set limit respectively.
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 any analogue signal to a
set of units, for instance pressure. The input and corresponding 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 required 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 correctly. –10,000 to 10,000 IN OUT
0 0
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 Scaling module is used to re-scale an analogue signal based on
minimum and maximum input and output values. From these values
the IAC scales all the points in between linearly.
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.
Signals can be reversed by using this module by setting, for example
0, 100 and 100, 0 this would reverse a 0 to 10Vdc input signal.
NOTE:- The Input Minimum Value must be less than the Input
Maximum Value for the Scaling Module to function correctly.
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
analogue 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 hysteresis on it. The Off threshold
must be less than or equal 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 any varying analogue signal to be slowed down or
smoothed. The time (in seconds) and a value are set. The output
value will then follow the input as long as it changes at/or slower than
the set value per set time period. If it changes faster than the values
set then the output will change only at the rate set. For example, the
module may be set at 5
°
C per 1 second, if the input changes by 10
°
C
in 1 second and stabilizes then the output will take two seconds to
equal the input.
DS 2.951A 4 - 24 05/98