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 Example

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 Example

In the FFLD "Free Form Ladder Diagram" 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 Example

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 Example

Not available.