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UMAX130511 Version 1.00A Preliminary Documentation
– May be subject to change
36 - 141
To summarize, Table 25 outlines the different responses that can be selected for object 30z4h,
both for the X-Axis type and for each point in the table.
Sub-Index
Value
Meaning
1
0
Data Response (X-Axis Type)
2 to 11
Ignore (this point and all following it)
1
1
Time Response (X-Axis Type)
2 to 11
Ramp To (this point)
1
2
N/A (not an allowed option)
2 to 11
Jump To (this point)
Table 25
– LTyz Point Response Options
1.7.4. X-Axis, Time Response
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.
With this response, the sequence will start depending on two parameters:
•
Lookup Table yz Input X-Axis Source
Object 3yz0h and;
•
Lookup Table yz Auto Repeat
Object 3yz2h
By default, the “Auto Repeat” object is set to FALSE (0). In this case, the lookup table will react in
the following way:
The X-Axis control source is treated as 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. reached index 11, or an ‘Ignored’ response), the output will
remain at the last output at the end of the profile until the control input turns OFF.
However
, when the “Auto Repeat” object is set to TRUE (1), the lookup table will react in the
following way:
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. reached index 11, or an
‘Ignored’ response), the lookup table will revert back to the first point in the table and Auto
Repeat the sequence. This will continue for as long as the input remains ON. Once the input
turns OFF, the lookup table sequence will stop and the output of the lookup table is zero.
Note:
When the control input is OFF, the output is always at zero. When the input comes ON, the
profile will
ALWAYS
start at position (X
1
, Y
1
) which is 0 output for 0ms.
In a time response, the data in object 30z6h
LTyz Point X-Axis PV
is measured in milliseconds,
and object 3yz3h
LTyz X-Axis Decimal Digits PV
is automatically set to 0. A minimum value of
1ms must be selected for all points other than sub-index 1 which is automatically set to [0,0]. The
interval time between each point on the X-axis can be set anywhere from 1ms to 24 hours.
[86,400,000 ms]
1.8.
Programmable Logic Function Block