Rice Lake iRite IDE - Manual (Page 23)

920i Programming Reference - Language Syntax 19 To be the best by every measure
3.3.3 Subprogram Declarations
A subprogram declaration defines the formal parameters, return type, local types and variables, and the
executable code of a subprogram. Subprograms include handlers, procedures, and functions.
Handler Declarations
A handler declaration defines a subprogram that is to be installed as an event handler. An event handler does not
permit parameters or a return type, and can only be invoked by the event dispatching system.
<handler-declaration>:
handler IDENTIFIER ';'
<decl-section>
begin
<stmt-list>
end ';'
;
HANDLER IDENTIFIER decl-section
;
stmt-list
; BEGIN END
Figure 3-8. Handler Declaration Syntax
Example:
handler SP1Trip;
I : Integer;
begin
for I := 1 to 10
loop
Writeln (1, "Setpoint Tripped!");
if I=2 then
return;
endif;
end loop;
end;
Procedure Declarations
A procedure declaration defines a subprogram that can be invoked by other subprograms. A procedure allows
parameters but not a return type. A procedure must be declared before it can be referenced; recursion is not
supported.
<procedure-declaration>:
procedure IDENTIFIER
<optional-formal-args> ';'
<decl-section>
begin
<stmt-list>
end ';'
;
<optional-formal-args>:
/* NULL */
| <formal-args>
;
<formal-args>: