BASIC commands
PROGRAMMING MANUAL 97
Revision 3.0
3.2.150 IF..THEN..ELSE..ENDIF
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3.2.151 IN
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Type Program control command
Syntax IF condition_1 THEN commands {ELSEIF condition_i THEN commands}
[ ELSE commands ] ENDIF
IF condition_1 THEN commands
Description This structure controls the flow of the program based on the results of the con-
dition. If the condition is TRUE the commands following THEN up to ELSEIF,
ELSE or ENDIF is executed. If the condition is FALSE and the command of a
subsequent ELSEIF substructre is TRUE, the commands of this substructure
are executed. If all conditions are FALSE the commands following ELSE will
be executed or the program will resume at the line after ENDIF in case no
ELSE is included. The ENDIF is used to mark the end of the conditional block.
Note: IF..THEN..ELSE..ENDIF sequences can be nested without limit. For a
multi-line IF..THEN construction, there must not be any statement after THEN.
A single-line construction must not use ENDIF.
Arguments • condition_i
A logical expression.
• commands
One or more BASIC commands.
Example IF MPOS > (0.22 * VR(0)) THEN GOTO exceeds_length
Example IF IN(0) = ON THEN
count = count + 1
PRINT "COUNTS = ";count
fail = 0
ELSE
fail = fail + 1
ENDIF
Example IF IN(stop)=ON THEN
OP(8,ON)
VR(cycle_flag)=0
ELSEIF IN(start_cycle)=ON THEN
VR(cycle_flag)=1
ELSEIF IN(step1)=ON THEN
VR(cycle_flag)=99
ENDIF
Example IF key_char=$31 THEN
GOSUB char_1
ELSEIF key_char=$32 THEN
GOSUB char_2
ELSEIF key_char=$33 THEN
GOSUB char_3
ELSE
PRINT "Character unknown"
ENDIF
See also N/A
Type I/O function
Syntax IN(input_number [ ,final_input_number ])
IN
Description The IN function returns the value of digital inputs.
• IN(input_number, final_input_number) will return the binary sum of
the group of inputs. The two arguments must be less than 24 apart.
• IN(input_number) with the value for input_number less than 32 will
return the value of the particular channel.
• IN (without arguments) will return the binary sum of the first 24 inputs (as
IN(0,23)).
Arguments • input_number
The number of the input for which to return a value. Value: An
integer between 0 and 31.
• final_ input_number
The number of the last input for which to return a value. Value: An
integer between 0 and 31.
I52E-EN-03.book Seite 97 Freitag, 29. Juni 2007 11:55 11
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