Rockwell Automation 57C610 Enhanced Basic Language, AutoMax - Manual (Page 49)

6Ć9
GOTO statements can use integer expressions instead of a constant
as the transfer line number; however, the expression must have an
integer as its final data type. For example, in your task, you are
reading data from DATA statements and, depending on the value of
variable OPTION%, you want to execute a specific routine. Assume
the values of OPTION% are 0 thru 10. In this example, the routines
or option handlers are located at line numbers 1000, 1100, 1200,
etc. (they are 100 apart for the starting line number). This GOTO
statement multiplies the value of OPTION % by 100 to get the
hundreds" value of the routine (100, 200, 300, etc.). This
hundreds" value is then added to the base value of all the option
handlers, which is 1000:
10 BASE_VALUE% = 1000
15 INPUT OPTION%
20 GOTO (BASE_VALUE% + (OPTION% * 100))
ąąă.
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1000 !ĆĆĆroutine for handling option #0
1010...
1020...
1100!ĆĆĆroutine for handling option #1
1110...
1120...
1200!ĆĆĆroutine for handling option #2
1210...
1220...
If the value resulting from the integer expression does not match any
line number in the task, the execution of the task will fall through to
the next statement and an error will be logged in the task error log.
The above operation can be performed more efficiently using the
ON GOTO" statement.
6.4.2 ON GOTO Statement
The ON GOTO statement is also a means of transferring control
within a program to another line, depending on the result of an
integer expression.
The ON GOTO statement has the following format:
ON integer_expression GOTO line_number_1,..., line_number_N
or
ON integer_expression GO TO line_number_1,...,
line_number_N
where:
integer_expression =
any arithmetic expression that
results in an integer value