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UMAX130511 Version 1.00A Preliminary Documentation
– May be subject to change
33 - 141
Each system will have to be tuned for the optimum output response. Response times, overshoots
and other variables will have to be decided by the customer using an appropriate PID tuning
strategy.
1.7.
Lookup Table Funtion Block
The lookup table (LTz) function blocks are not used by default.
Figure 15
– Lookup Table Objects
Lookup tables are used to give an output response of up to 10 slopes per input.
The array
size of the objects 3yz5h
LTyz Point Response
, 3yz6h
LTyz Point X-Axis PV
and 3yz7h
Point
Y-Axis PV
shown in the block diagram above is therefore 11.
Note: If more than 10 slopes are required, a Programmable Logic Block can be used to combine
up to three tables to get 30 slopes, as is described in Section 1.8.
A parameter that will affect the function block is object
3yz5h sub-index 1
which defines the “
X-
Axis Type
”. By default, the tables have a
‘Data Response’
output (0). Alternatively, it can be
selected as a
‘Time Response’
(1).
There are two (or three) other key parameters that will affect how this function block will behave
depending on the “
X-Axis Type
” chosen. If chosen
‘Data Response’
, then the objects 3yz0h
Lookup Table yz Input X-Axis Source
and
3yz1h
Lookup Table yz Input X-Axis Number
together define the control source for the function block. When it is changed, the table values in
object 3yz6h need to be updated with new defaults based on the X-Axis source selected as
described in Tables 15 and 16
. If however, the “
X-Axis Type
” is chosen to be
‘Time Response’
, an
additional parameter is taken into consideration - object 3yz2h,
Lookup Table yz Auto Repeat
.
These will be described in more detail in Section 1.7.4.