UMAX090600 Version 1
Preliminary Documentation – May be Subject to Change
12-48
1.5.3.
Point To Point Response
By default, the X and Y axes are setup for a linear response from point (0,0) to (10,10), where the
output will use linearization between each point. To get the linearization, each
Point N – Response,
where N = 1 to 10, is setup for a
‘Ramp To’
output response.
Alternatively, the user could select a
‘Jump To’
response for
Point N – Response
, where N = 1 to
10. In this case, any input value between X
N-1
to X
N
will result in an output from the Lookup Table
function block of Y
N
.
An example of a CAN message (0 to 100) used to control a default table (0 to 100) but with a
‘Jump
To’
response instead of the default
‘Ramp To’
is shown in
Figure 3
.
Figure 3: Lookup Table 'Jump To' Data Response
Lastly, any point except (0,0) can be selected for an
‘Ignore’
response. If
Point N – Response
is set
to ignore, then all points from (X
N
, Y
N
) to (X
10
, Y
10
) will also be ignored. For all data greater than X
N-
1
, the output from the Lookup Table function block will be Y
N-1.
1.5.4.
X-Axis, Time Response
As mentioned in Section 1.5, a Lookup Table can also be used to get a custom output response
where the
X-Axis Type
is a
‘Time Response.’
When this is selected, the X-Axis now represents time,
in units of milliseconds, while the Y-Axis still represents the output of the function block.
In this case, the
X-Axis Source
is treated as a digital input. If the signal is actually an analog input, it
is interpreted like a digital input. When the control input is ON, the output will be changed over a
period of time based on the profile in the Lookup Table. Once the profile has finished (i.e. index 10,
or
‘Ignored’
response), the output will remain at the last output at the end of the profile until the
control input turns OFF.
