Ladder Diagram Integration

R2026b
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 CoderGenerate structured text and ladder diagram code from Simulink models, Stateflow charts, and MATLAB functions

Functions

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plcimportladderImport ladder diagram into a Simulink subsystem
plcgeneratecodeGenerate structured text or ladder diagram (L5X) for the atomic subsystem
plcladderinstructionsLists ladder instructions identified by Simulink PLC Coder
plcladderlibOpen the Simulink PLC Coder Ladder Library
plcgeneraterunnertbGenerate L5X test bench code for specified AOI Runner block and AOI name
plcladderoptionGet or set parameter values for ladder diagram model
plcloadtypesLoad the data types for Simulink PLC Coder ladder models
plccleartypesClear the data types associated with the Simulink PLC Coder ladder models from the workspace

Blocks

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ONS blockONSOne Shot
OSR blockOSROne Shot Rising
OSF blockOSFOne Shot Falling
XIC blockXICExamine If Closed
XIO blockXIOExamine If Open
OTE blockOTEOutput Energize
OTL blockOTLOutput Latch
OTU blockOTUOutput Unlatch
TON blockTONTimer On Delay
TOF blockTOFTimer Off Delay
RTO blockRTORetentive Timer On
CTU blockCTUCount Up
CTD blockCTDCount Down
RES blockRESReset
JMP blockJMPJump
LBL blockLBLLabel
TND blockTNDTemporary End
AFI blockAFIAlways False
NOP blockNOPNo Operation
MCR blockMCRMaster Control Reset
ADD blockADDAdd inputs
SUB blockSUBSubtract inputs
MUL blockMULMultiply inputs
DIV blockDIVDivide one input by another
CPT blockCPTEvaluate expression
AND blockANDBitwise AND
OR blockORBitwise OR
NOT blockNOTBitwise NOT
NEQ blockNEQNot Equal To
EQU blockEQUEqual To
LEQ blockLEQLess Than or Equal To
GEQ blockGEQGreater Than or Equal To
LES blockLESLess Than
GRT blockGRTGreater than
MOV blockMOVMove
CLR blockCLRClear
COP blockCOPCopy File
FLL blockFLLFile Fill
AOI Runner blockAOI RunnerAOI Runner
PLC Controller Suite blockPLC Controller SuitePLC Controller
PLC Controller blockPLC ControllerPLC Controller
Task blockTaskTask
Program blockLadder Diagram ProgramLadder Diagram Program
Subroutine blockLadder Diagram SubroutineLadder Diagram Subroutine
Function Block (AOI) blockLadder Diagram Function Block (AOI)Ladder Diagram Function Block (AOI)
Variable Read blockVariable ReadVariable Read
Variable Write blockVariable WriteVariable Write
Power Rail Start blockPower Rail StartPower Rail Start
Power Rail Terminal blockPower Rail TerminalPower Rail Terminal
RungTerminal blockRung TerminalRung Terminal
Junction blockJunctionJunction
Custom Instruction blockCustom InstructionCreate custom ladder logic instruction

Topics

Featured Examples

Tank Control Simulation and Code Generation by Using Ladder Logic

Tank Control Simulation and Code Generation by Using Ladder Logic

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

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

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.

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

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.

Model and Generate Code for Jump and Label Ladder Diagram Instructions

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.

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

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

Rapidly prototype the ladder logic-based controller for a single car elevator by using Simulink® PLC Coder™ to model and simulate the ladder logic. After verifying that the controller works for your requirements, generate code for the controller.