Added double curly braces for pragma (kept single curly braces for compatibility). Added macro def and undef surrounding pragma to simplify user code. Moved useless comment from generated code back to code generator.
(* Following taken directly from the IEC 61131.3 draft standard *)
(*
* An IEC 61131-3 IL and ST compiler.
*
* Based on the
* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
*
*)
FUNCTION_BLOCK INTEGRAL
VAR_INPUT
RUN : BOOL ; (* 1 = integrate, 0 = hold *)
R1 : BOOL ; (* Overriding reset *)
XIN : REAL ; (* Input variable *)
X0 : REAL ; (* Initial value *)
CYCLE : TIME ; (* Sampling period *)
END_VAR
VAR_OUTPUT
Q : BOOL ; (* NOT R1 *)
XOUT : REAL ; (* Integrated output *)
END_VAR
Q := NOT R1 ;
IF R1 THEN XOUT := X0 ;
ELSIF RUN THEN XOUT := XOUT + XIN * TIME_TO_REAL(CYCLE);
END_IF ;
END_FUNCTION_BLOCK