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 (Since R2019a)

Test Bench Generation

plcgeneraterunnertb Generate L5X test bench code for specified AOI Runner block and AOI name (Since R2019a)

Options and Data Types

`plcladderoption`	Get or set parameter values associated with Ladder Diagram models (Since R2019a)
`plcloadtypes`	Load the data types for Simulink PLC Coder ladder models (Since R2019a)
`plccleartypes`	Clear the data types associated with the Simulink PLC Coder ladder models from the workspace (Since R2019a)

Blocks

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Bit Operations

ONS	One Shot (Since R2019a)
OSR	One Shot Rising (Since R2019a)
OSF	One Shot Falling (Since R2019a)
XIC	Examine If Closed (Since R2019a)
XIO	Examine If Open (Since R2019a)
OTE	Output Energize (Since R2019a)
OTL	Output Latch (Since R2019a)
OTU	Output Unlatch (Since R2019a)

Timers and Counters

TON	Timer On Delay (Since R2019a)
TOF	Timer Off Delay (Since R2019a)
RTO	Retentive Timer On (Since R2019a)
CTU	Count Up (Since R2019a)
CTD	Count Down (Since R2019a)
RES	Reset (Since R2019a)

Program Control

JMP	Jump (Since R2019a)
LBL	Label (Since R2019a)
TND	Temporary End (Since R2019a)
AFI	Always False (Since R2019a)
NOP	No Operation (Since R2019a)
MCR	Master Control Reset (Since R2019a)

Math, Logical, and Comparison Operations

ADD	Add inputs (Since R2019a)
SUB	Subtract inputs (Since R2019a)
MUL	Multiply inputs (Since R2019a)
DIV	Divide one input by another (Since R2019a)
CPT	Evaluate expression (Since R2019a)
AND	Bitwise AND (Since R2019a)
OR	Bitwise OR (Since R2019a)
NOT	Bitwise NOT (Since R2019a)
NEQ	Not Equal To (Since R2019a)
EQU	Equal To (Since R2019a)
LEQ	Less Than or Equal To (Since R2019a)
GEQ	Greater Than or Equal To (Since R2019a)
LES	Less Than (Since R2019a)
GRT	Greater than (Since R2019a)

Memory and File Operations

MOV	Move (Since R2019a)
CLR	Clear (Since R2019a)
COP	Copy File (Since R2019a)
FLL	File Fill (Since R2019a)

Organizational Units

AOI Runner	AOI Runner (Since R2019a)
PLC Controller Suite	PLC Controller (Since R2019a)
PLC Controller	PLC Controller (Since R2019a)
Task	Task (Since R2019a)
Ladder Diagram Program	Ladder Diagram Program (Since R2019a)
Ladder Diagram Subroutine	Ladder Diagram Subroutine (Since R2019a)
Ladder Diagram Function Block (AOI)	Ladder Diagram Function Block (AOI) (Since R2019a)

Input/Output

Variable Read	Variable Read (Since R2019a)
Variable Write	Variable Write (Since R2019a)

Reference Blocks

Power Rail Start	Power Rail Start (Since R2019a)
Power Rail Terminal	Power Rail Terminal (Since R2019a)
Rung Terminal	Rung Terminal (Since R2019a)
Junction	Junction (Since R2019a)

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