Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 508)

<Appendix G User Program>
App.G-9
IM 11B08A01-01E
GOTO
Function Diverges unconditionally to the specifi ed label.
Format GOTO label
Explanation Diverges unconditionally to the specifi ed label.
Error will occur at time of executing the GOTO statement when the specifi ed
divergence destination label is not in the program. Error will also occur when the
GOTO statement is used to move the control to the block (FOR/NEXT, IF..THEN/
ENDIF, IF..THEN/ELSE/ENDIF, WHILE/END WHILE).
Notes on programming
Avoid creating an infi nite loop with the GOTO statement such as LA@GOTO
LA@ (it is a waste of execution time).
Use the WHILE/END WHILE statement to create an infi nite loop.
IF...THEN/ENDIF, IF...THEN/ELSE/ENDIF, IF...THEN/ELSEIF...THEN/(ELSE/)ENDIF Statement
Function Creates a divergence in compliance with equation results or specifi ed conditions.
Format IF equation THEN
Statement
[ELSE
Statement]
ENDIF
Statement: Can be composed into multiple lines.
Multiple IF statements are also possible.
Explanation When the equation result is TRUE (other than zero), execute the statement from
THEN onward, and execute the ELSE statement when it is FALSE (zero).
Relational expression such as (A>0) is often used for the equation. Other
equations can be used but the result must be expressed in numerical value.
(1) When the result is TRUE (≠0), execute the text in the multiple lines after
THEN up to either ELSE or END.
(2) When the result is FALSE (=0), execute statement in multiple lines after
ELSE to ENDIF.
Processes following ELSE can be omitted (the program after THEN will stop by
executing ENDIF).
LET Statement
Function Replaces the variable on the left side of the equation with the calculation results of
right side of the equation.
Format (1) LET variable name = equation
(2) Variable name = equation
Variable name: Numeric variable name
Equation: Numerical formula
LET can be omitted.
Explanation None
READ Statement
Function Reads values from DATA statements and allocates to variables.
Format READ variable name [,variable name, …]
Variable name: Numeric
Explanation The READ statement is always used in combination with the DATA statement.
The READ statement allocates data that have been set by the DATA statement to
the variables one by one.
Error will occur when there are no data to allocate to the READ statement
variables.
Use the RESTORE statement to repeatedly read out the same DATA statement
data or to specify the DATA statement for read-out.
2nd Edition : May 11, 2012-00
App.G