Jumps JMP JMPC JMPNC JMPCN

Statement - Jump to a label.

Remarks

A jump to a label branches the execution of the program after the specified label.

See Insert Jump for directions on how to add a jump to a label.

Backward jumps can lead to infinite loops that block the target cycle.

FBD Language

In the FBD "Function block diagram" A function block diagram describes a function between input variables and output variables. A function is described as a set of elementary blocks language, a jump is represented by a signpost containing the label name.
- The input of the signpost must be connected to a valid Boolean signal.
- The jump is performed only if the input is TRUE.

(* In this example the TON block will not be called if bEnable is TRUE. *)

FFLD Language

In the FFLD language, the Insert Jump symbol (), followed by the target label name, is used as a coil at the end of a rung.
- The jump is performed only if the rung state is TRUE.
Each rung can begin with a label.
Labels are used as a destination for jump instructions.

In this example Network #6 is skipped if IN1 is TRUE.

IL Language

In the IL "Instruction list" This is a low-level language and resembles assembly language, JMP, JMPC, JMPCN and JMPNC instructions are used to specify a jump.
- The destination label is the operand of the jump instruction.

These are the meaning of possible jump instructions:

JMP Jump always
JMPC Jump if the current result is TRUE
JMPNC Jump if the current result is FALSE
JMPCN Same as JMPNC

(* My comment. *)
Start:   FFLD   IN1
         JMPC   TheRest (* Jump to "TheRest" if IN1 is TRUE *)

         FFLD   IN2     (* these three instructions are not executed *)
         ST     Q2      (* if IN1 is TRUE *)
         JMP    TheEnd  (* unconditional jump to "TheEnd" *)

TheRest: FFLD   IN3
         ST     Q3
TheEnd:

ST Language

Not available.