Logic Programming
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30.4.3 Inserting an instruction/branch using IL

This section explains how to describe a logic program using IL.

Instruction Name

Description

illustration

SOR

Indicates a starting point of a circuit.

From an SOR to the next SOR is one circuit.

Frame A

BS

Indicates a starting point of a branch.

The section from BS to B is the upper portion of the branch in the ladder configuration.

Frame B

B

Indicates a branch (lower portion).

The section from B to BE is the lower portion of the branch in the ladder configuration.

Frame C

BE

Indicates an ending point of a branch.

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Inserting Rungs/Instructions

  1. Select the first rung (MAIN START).

  2. Click the icon . An SOR (Circuit Starting Point) is inserted into the rung next to the MAIN START, and then a box for adding an instruction is displayed.

    • An SOR (Circuit Starting Point) can also be inserted using the icon or right-click menu as shown below.

  3. You can insert the instruction using the icon or typing the instruction name.

  4. Allocate a symbol variable to [Operand 1] for the instruction.

Inserting Branches

  1. Select the instruction (NO instruction) to insert the branch.

  2. Click the icon . BS, B and BE are inserted.
    The sections from BS to B and from B to BE are the upper portion and lower portion of the branch, respectively, in the ladder configuration.