UMAX030211 Version 1.0.2. Preliminary Documentation – May be subject to change
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2.5.3.
Logic Block Output
Recall that Table Y, where Y = A, B or C in the LB(x-3) function block does NOT mean lookup table
1 to 3. Each table has object 3x01h LB(x-3)
Lookup Table Number
which allows the user to select
which lookup tables they want associated with a particular logic block. The default tables associated
with each logic block are listed in Table 21.
Programmable Logic
Block Number
Table A – Lookup
Table Block Number
Table B – Lookup
Table Block Number
Table C – Lookup
Table Block Number
1
1
2
3
2
4
4
4
Table 21 – LB(x-3) Default Lookup Tables
If the associated Lookup Table YZ (where YZ equals 3310h sub-index X) does not have an
“X-Axis
Source”
selected, then the output of LB(x-3) will always be “Not Available” so long as that table is
selected. However, should LT0z be configured for a valid response to an input, be it Data or Time,
the output of the LT0z function block (i.e. the Y-Axis data that has been selected based on the X-
Axis value) will become the output of the LB(x-3) function block so long as that table is selected.
The LB(x-3) output is always setup as a percentage, based on the range of the Y-Axis for the
associated table (see Section 2.4.2) It is written to sub-index X of read-only object 3320h
Logic
Block Output PV
with a resolution of 1 decimal place.