UMAX090600 Version 1
Preliminary Documentation – May be Subject to Change
10-48
Initialize the Control Source of a Lookup Table BEFORE changing the table values, as
the new settings WILL get erased when the control is updated if the
Auto update when
control changes
in the Miscellaneous function block is set to
‘True’
.
1.5.
Lookup Table Function Block
Figure 2: Lookup Table Function Block
Lookup Tables are used to give an output response of up to 10 slopes per input. The array size of
the Response [ ], Point X [ ] and Point Y [ ] setpoints shown in the block diagram above is therefore
11.
There are two key setpoints that will affect this function block. The first is the
X-Axis Source
and
X-
Axis Number
which together define the Control Source for the function block. When it is changed,
the table is automatically updated with new defaults based on the X-Axis source selected if
Auto
update when control changes
in the Miscellaneous block is ‘
True’.
As stated earlier if
Auto update when control changes
is
’True’,
should the selected Control Source
change (i.e. the Min or Max values of the function block are updated), the associated table will also
be automatically updated with default settings, based on the new X-Axis limits.
The second setpoint that will affect the function block (i.e. reset to defaults), is the
X-Axis Type
. By
default, the tables have a
‘Data Response’
output. Alternatively, it can be selected as a
‘Time
Response’,
which is described later in Section 1.5.5.
