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36
WVRC-4 Plus Installation and Operation Manual
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Conditional:
Conditional statements must be encompassed in open and closed parenthesis and
additional parenthesis are allowed within the statement in order to enforce evalua-
tion order. Conditionals must be separated by the & or the | symbols to indicate
Boolean AND and Boolean OR operations. If after evaluating every conditional
statement and applying the AND and OR operators the conditional results as TRUE
then the TRUE clause will be executed, if the conditional results as FALSE then the
FALSE clause will be executed.
Status:
The status conditional takes 2 parameters, the status number and whether it
is high or low. The following are valid status conditionals:
S01H
S02L
The first will evaluate as TRUE if Status Input 1 is high and will evaluate as FALSE
if Status Input 1 is low. The second will evaluate as TRUE if Status Input 2 is low
and will evaluate as FALSE if Status Input 2 is high.
Since there are 4 status inputs S01x to S04x are allowed Status Conditionals.
Meters:
The meter conditional takes 2 parameters, the meter number and whether
it is in high alarm or low alarm. The following are valid meter conditionals.
M01H
M01L
The first will evaluate as TRUE if Meter Input 1 is in high alarm and will evaluate
as FALSE if Meter Input 1 is either in low alarm or not in an alarm. The second will
evaluate as TRUE if Meter Input 2 is in low alarm and will evaluate as FALSE if
Meter Input 2 is either in high alarm or not in an alarm. Since there are 4 status
inputs M01x to M04x are allowed Meter Conditionals.
Relays:
The relay conditional takes 2 parameters, the relay number and whether it
is high or low. The following are valid relay conditionals:
R01H
R02L
The first will evaluate as TRUE if Relay 1 is high and will evaluate as FALSE if Relay
1 is low. The second will evaluate as TRUE if Relay 2 is low and will evaluate as
FALSE if Relay 2 is high.
Booleans
: There are 99 Boolean variables that can be set in clauses and read as con-
ditionals. At start-up all 99 Boolean variables default to FALSE. The Boolean con-
ditional takes 2 parameters, the Boolean number and whether it is true or false. The
following are valid Boolean conditionals:
B01H
B02L
