Ladder Diagram Integration

Import, simulate, and validate your existing ladder diagrams. Model, simulate, and generate code using the provided Ladder Diagram blocks and functions

Ladder Diagram is a graphical programming language that you use to develop software for programmable logic controllers (PLCs). It is one of the languages that the IEC 61131 standard specifies for use with PLCs. A program in ladder diagram notation is a circuit diagram that emulates circuits of relay logic hardware. The underlying program uses Boolean expressions that translate readily to switches and relays.

With Simulink^® PLC Coder™, you can use ladder import to import ladder diagrams created with Rockwell Automation^® IDEs, such as RSLogix™ 5000 and Studio 5000 into the Simulink environment as a model. You can create ladder diagrams in the Simulink environment as a model.

After importing or creating the ladder diagram models, you can:

Edit the imported Ladder Diagram model from within Simulink by using the plcladderlib library.
After importing the ladder diagram code into Simulink, simulate it.
Generate C code from the imported ladder diagram and integrate the code into your existing C language-based simulation environments.
Generate ladder diagram code from the imported ladder diagram and integrate the code into your Rockwell Automation IDE. You cannot generate structured text code from the Ladder Diagram blocks.
Generate PLC testbench code for the imported ladder diagram and verify the code in your Rockwell Automation IDE.

Apps

Simulink PLC Coder

Generate structured text and ladder diagram code from Simulink models, Stateflow charts, and MATLAB functions (Since R2019b)

Functions

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Import and Code Generation

`plcimportladder`	Import ladder diagram into a Simulink subsystem
`plcgeneratecode`	Generate structured text or ladder diagram (L5X) for the atomic subsystem
`plcladderinstructions`	Lists ladder instructions identified by Simulink PLC Coder (Since R2020a)

Create Ladder Drawing

plcladderlib Open the Simulink PLC Coder Ladder Library

Test Bench Generation

plcgeneraterunnertb Generate L5X test bench code for specified AOI Runner block and AOI name

Options and Data Types

`plcladderoption`	Get or set parameter values associated with Ladder Diagram models
`plcloadtypes`	Load the data types for Simulink PLC Coder ladder models
`plccleartypes`	Clear the data types associated with the Simulink PLC Coder ladder models from the workspace

Blocks

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Bit Operations

ONS	One Shot
OSR	One Shot Rising
OSF	One Shot Falling
XIC	Examine If Closed
XIO	Examine If Open
OTE	Output Energize
OTL	Output Latch
OTU	Output Unlatch

Timers and Counters

TON	Timer On Delay
TOF	Timer Off Delay
RTO	Retentive Timer On
CTU	Count Up
CTD	Count Down
RES	Reset

Program Control

JMP	Jump
LBL	Label
TND	Temporary End
AFI	Always False
NOP	No Operation
MCR	Master Control Reset

Math, Logical, and Comparison Operations

ADD	Add inputs
SUB	Subtract inputs
MUL	Multiply inputs
DIV	Divide one input by another
CPT	Evaluate expression
AND	Bitwise AND
OR	Bitwise OR
NOT	Bitwise NOT
NEQ	Not Equal To
EQU	Equal To
LEQ	Less Than or Equal To
GEQ	Greater Than or Equal To
LES	Less Than
GRT	Greater than

Memory and File Operations

MOV	Move
CLR	Clear
COP	Copy File
FLL	File Fill

Organizational Units

AOI Runner	AOI Runner
PLC Controller Suite	PLC Controller
PLC Controller	PLC Controller
Task	Task
Ladder Diagram Program	Ladder Diagram Program
Ladder Diagram Subroutine	Ladder Diagram Subroutine
Ladder Diagram Function Block (AOI)	Ladder Diagram Function Block (AOI)

Input/Output

Variable Read	Variable Read
Variable Write	Variable Write

Reference Blocks

Power Rail Start	Power Rail Start
Power Rail Terminal	Power Rail Terminal
Rung Terminal	Rung Terminal
Junction	Junction

Custom PLC Instruction

Custom Instruction

Create custom ladder logic instruction (Since R2020a)

Topics

Supported Elements in Ladder Diagram
Ladder features and elements that are supported by Simulink PLC Coder.
Import L5X Ladder Diagram Files into Simulink
Import L5X ladder diagram files into Simulink.
Model and Simulate Ladder Diagrams in Simulink
Create and simulate ladder Diagrams in Simulink.
Generating Ladder Diagram Code from Simulink
Generate Ladder Diagram code (L5X) from Simulink.
Generating C Code from Simulink Ladder
Generate C code from a Simulink Ladder Diagram Model.
Verify Generated Ladder Diagram Code
Verify generated code against the original Simulink model in your IDE using a generated test bench.
Create Custom Instruction in PLC Ladder Diagram Models
Create user-defined instruction in PLC Ladder Diagram models.

Featured Examples

Tank Control Simulation and Code Generation by Using Ladder Logic

Simulate ladder logic and generate code from the ladder tank controller model.

Open Script

Simulate, Model, and Generate Code for Timer-Based Ladder Logic

Model and simulate ladder logic for a simple timer-based motor controller. The ladder logic based controller uses an on-delay timer to delay the start of the motor and an off-delay timer to delay the stopping of the motor. After verifying that the controller and timers function for your requirements generate code for the controller.

Open Live Script

Model, Simulate, and Generate Code for a Ladder Logic-Based Temperature Controller

Model and simulate a ladder logic-based temperature controller of a home. The ladder logic controls the heater based on the thermostat settings and the outside ambient temperature. After verifying that the controller functions for your requirements, generate code for your controller.

Open Live Script

Model and Generate Code for Jump and Label Ladder Diagram Instructions

Model a ladder diagram in Simulink® that uses the JMP and LBL instructions. Simulate the ladder diagram to verify its behavior and generate ladder diagram code from the model. The JMP and LBL instructions branch and loop the ladder diagram code.

Open Live Script