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What is PLC Instruction List (IL)?


PLC Instruction List (IL) is a language used in a PLC (Programmable Logic Controller) program. These instructions define the actions that a PLC will perform and are loaded into the memory unit of the PLC. PLC programs typically consist of a series of instructions and conditions that are loaded into the memory unit of a PLC.

What is PLC Instruction List (IL)?

Instruction List (IL) is a text-based, low-level PLC language defined by IEC 61131-3. Instructions execute sequentially using an accumulator (ACC) and an optional stack. In this simulation you can edit, assemble, and run/step IL code while observing inputs/outputs, ACC, a TON timer, and a CTU counter.

Program Editor (IL)

Presets:

Speed

Live Visualization

Inputs

Outputs

Q0: OFF Q1: OFF

Timer (TON)

2.00 s

TON: IDLE

Accumulator & Stack

ACC: FALSE ENO: TRUE

Instruction Pointer

Counter C0 (CTU)

CV: 0 / PV: 5
PV = 5

CTU Done: FALSE

How to use: Edit the IL, press Assemble, then use Run or Step. Toggle inputs to see how ACC evolves and how outputs change. In the Timer (TON) preset, the bar fills until the preset time and then turns the output ON. In the Counter (CTU) preset, use I0 as the pulse input, I1 to reset, adjust PV with the slider, and observe when CV ≥ PV the Done flag becomes TRUE and Q1 turns ON.

PLC Instruction List (IL) instructions are used to define the operations that will be performed in a PLC program. These operations can include physical actions to be performed by the PLC or mathematical operations to be performed by the PLC. For example, there may be instructions in a PLC program to start a motor or to multiply one number by another.

PLC Instruction List (IL) instructions are typically written using a programming language specific to the PLC. For example, languages used for Siemens PLCs include LAD (Ladder Diagram) for S7-300 and S7-1200 PLCs, and STL (Statement List) for S7-1500 PLCs.

Some examples of PLC Instruction List (IL) instructions include:

    ADD: performs the addition of two numbers
    AND: performs the AND operation on two numbers
    CMP: compares two numbers
    JMP: jumps to the labeled location
    LD: loads the value at the specified address
    MOV: copies a value to another value
    OR: performs the OR operation on two numbers
    OUT: loads the value at the specified address to the output
    ST: stores the specified value to the specified address

These are just a few examples, and the full list of PLC Instruction List (IL) instructions may vary depending on the PLC model and programming language being used.

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