Mitsubishi Electric MELSEC L series, Programming Manual

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4 ST PROGRAM EXPRESSIONS
[Description example]
(a) When actual devices are used in Boolean expressions
IF D0 < 100 THEN (* If D0 is less than 100 *)
D1 : = 0; (* 0 is assigned to D1. *)
ELSIF D0 <= 200 THEN (* If D0 is less than or equal to 200 *)
D1 : = 1; (* 1 is assigned to D1. *)
ELSIF D0 <= 300 THEN (* If D0 is less than or equal to 300 *)
D1 : = 2; (* 2 is assigned to D1. *)
END_IF;
(b) When operators are used in Boolean expressions
IF (D0*D1) < 100 THEN (* If D0*D1 is less than 100 *)
D1 : = 0; (* 0 is assigned to D1. *)
ELSIF (D0*D1) <= 200 THEN (* If D0*D1 is less than or equal to 200 *)
D1 : = 1; (* 1 is assigned to D1. *)
ELSIF (D0*D1) <= 300 THEN (* If D0*D1 is less than or equal to 300 *)
D1 : = 2; (* 2 is assigned to D1. *)
END_IF;
(c) When functions are used in Boolean expressions
IF INT_TO_BOOL (D0) = TRUE THEN (* If INT_T0_BOOL (D0) is *)
(* TRUE *)
D1 : = 0; (* 0 is assigned to D1. *)
ELSIF INT_TO_BOOL (D0) = TRUE THEN (* If INT_T0_BOOL(D2) is *)
(*
TRUE *)
D1 : = 1; (* 1 is assigned to D1. *)
END_IF;