Comments
Comments can be used to document the purpose of a program. They have no affect on the run-time operation of the program.
In DPL comments begin with either // or ; and continue to the end of the line. The following code fragment shows examples of comments.
See Also
Notes/ Description Section
DPL (Drive Programming Language) Reference
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Constructs
This section defines the DPL constructs such as assignment statements and loops.
In DPL the end of a text line is used as the statement delimiter. This means that it is not possible to place two statements on one line. For example:
A% = 1
B% = 23
is valid and will compile, but:
A% = 1 B% = 23
is invalid and will not compile.
For more information, see:
Variable Assignment
Array Element Assignment
Parameter Assignment
#INT Parameter Assignment
Parameter Pointer Assignment
DO WHILE Loop
EXIT
IF ... THEN
FOR Loop
Function Block Call
GOTO
SELECT
Subroutine Call
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Variable Assignment
A variable assignment construct copies an expression value into a non-array variable.
Target/ Language Restrictions
None.
See Also
Constructs
Array Element Assignment
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Array Element Assignment
An array element assignment construct copies an expression value into a single element in an array variable.
Target/ Language Restrictions
None.
See Also
Constructs
Variable Assignment
Parameter Assignment
A parameter assignment construct copies an expression value into a parameter
Target/ Language Restrictions
None.
See Also
Constructs
Variable Assignment
Parameters
#INT Parameter Assignment
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#INT Parameter Assignment
A #INT (or cast) parameter assignment construct copies an integer expression value into a parameter. The actual value written into the parameter depends on the number of decimal places defined for the parameter.
Target/ Language Restrictions
None.
See Also
Constructs
Variable Assignment
Parameter Assignment
Parameters
Parameter Pointer Assignment
A Parameter Pointer assignment construct copies an integer expression value into a parameter indexed by an integer variable.
The value of Variable% is used to identify a parameter. The value should be in the format MMPP, e.g 121 specifies parameter #1.21.
Example
Target/ Language Restrictions
None.
See Also
Constructs
Variable Assignment
Parameter Assignment
#INT Parameter Assignment
Parameters
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DO WHILE Loop
This construct performs a loop while a condition is true. These are three syntaxes for the WHILE loop.
Syntax 1 evaluates the condition first before any statements are executed. If the condition is false, the statements are not executed. If the condition is true the statements are executed and will continue to be executed as long as the condition is true.
Syntax 2 executes the statements once regardless of whether the condition is true. The statements will then continue to be executed until the condition becomes false.
Syntax 3 loops while the condition is true.
Target/ Language Restrictions
None.
See Also
Constructs
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EXIT
The EXIT statement is a flow-control statement which causes execution of a task to finish.
|
Note: |
If the task is a real-time task (CLOCK, POS0 etc), the task will continue to be scheduled at its defined rate. |
Example
Target/ Language Restrictions
None.
See Also
Constructs
IF ... THEN
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