User Manual UMAX030541. Version V1 26-116
By default, both arguments are set to
‘Control Source Not Used’
which disables the
condition, and automatically results in a value of N/A as the result. Although it is generally
considered that each condition will be evaluated as either TRUE or FALSE, the reality is
that there could be four possible results, as described in Table 15.
Value Meaning
Reason
0
False
(Argument 1) Operator (Argument 2) = False
1
True
(Argument 1) Operator (Argument 2) = True
2
Error
Argument 1 or 2 output was reported as being in an error state
3
Not
Applicable
Argument 1 or 2 is not available (i.e. set to
‘Control Source Not
Used’
)
Table 15
– LB(x-3) Condition Evaluation Results
1.5.2 Table Selection
In order to determine if a particular table will be selected, logical operations are performed
on the results of the conditions as determined by the logic in Section 1.5.1. There are
several logical combinations that can be selected, as listed in Table 16. The default value
for object 3x02h
LB(x-3) Function Logical Operator
is dependent on the sub-index. For
sub-index 1 (Table A) and 2 (Table B), the
‘Cnd1 And Cnd2 And Cnd3’
operator is used,
whereas sub-index 3 (Table C) is setup as the
‘Default Table’’
response.
Value Meaning
0
Default Table
1
Cnd1 And Cnd2 And Cnd3
2
Cnd1 Or Cnd2 Or Cnd3
3
(Cnd1 And Cnd2) Or Cnd3
4
(Cnd1 Or Cnd2) And Cnd3
Table 16
– LB(x-3) Function Logical Operator Options
