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Supported Blocks

For Simulink^® semantics not supported by Simulink PLC Coder™, see Structured Text Code Generation Limitations.

View Supported Blocks Library

To view a Simulink library of blocks that the Simulink PLC Coder software supports, type plclib in the Command Window. The coder can generate Structured Text code for subsystems that contain these blocks. The library window is displayed.

This library contains two sublibraries, Simulink and Stateflow^®. Each sublibrary contains the blocks that you can include in a Simulink PLC Coder model.

Supported Simulink Blocks

The coder supports the following Simulink blocks.

Additional Math & Discrete/Additional Discrete

Transfer Fcn Direct Form II

Transfer Fcn Direct Form II Time Varying

Unit Delay Enabled (Obsolete)

Unit Delay Enabled External IC (Obsolete)

Unit Delay Enabled Resettable (Obsolete)

Unit Delay Enabled Resettable External IC (Obsolete)

Unit Delay External IC (Obsolete)

Unit Delay Resettable (Obsolete)

Unit Delay Resettable External IC (Obsolete)

Unit Delay With Preview Enabled (Obsolete)

Unit Delay With Preview Enabled Resettable (Obsolete)

Unit Delay With Preview Enabled Resettable External RV (Obsolete)

Unit Delay With Preview Resettable (Obsolete)

Unit Delay With Preview Resettable External RV (Obsolete)

Discrete-Time Integrator

Coulomb and Viscous Friction

Discrete Transfer Fcn

Discrete Derivative

Discrete FIR Filter

Discrete Filter

Discrete PID Controller

Discrete PID Controller (2 DOF)

Discrete State-Space

Discrete-Time Integrator

FIR Interpolation (DSP System Toolbox)

Integer Delay

Memory

Tapped Delay

Transfer Fcn First Order

Transfer Fcn Lead or Lag

Transfer Fcn Real Zero

Unit Delay

Zero-Order Hold

Logic and Bit Operations

Detect Fall Nonpositive

Detect Rise Nonnegative

Detect Rise Positive

Extract Bits

Interval Test

Interval Test Dynamic

Logical Operator

Shift Arithmetic

Lookup Tables

Dynamic-Lookup

Interpolation Using Prelookup

MinMax Running Resettable

Trigonometric Function

Check Discrete Gradient

Check Dynamic Lower Bound

Check Dynamic Upper Bound

Check Input Resolution

Check Static Lower Bound

Check Static Upper Bound

Function-Call Subsystem

Repeating Sequence Interpolated

Repeating Sequence Stair

User-Defined Functions

MATLAB Function (MATLAB Function Block)

Supported Stateflow Blocks

The coder supports the following Stateflow blocks.

Stateflow

Chart (Stateflow)

State Transition Table (Stateflow)

Truth Table (Stateflow)

Blocks with Restricted Support

Simulink Block Support Exceptions

The Simulink PLC Coder software supports the plclib blocks with the following exceptions. Also, see Structured Text Code Generation Limitations for a list of limitations of the software.

If you get unsupported fixed-point type messages during code generation, update the block parameter. Open the block parameter dialog box. Navigate to the Signal Attributes and Parameter Attributes tabs. Check that the Output data type and Parameter data type parameters are not Inherit: Inherit via internal rule. Set these parameters to either Inherit: Same as input or a desired non-fixed-point data type, such as double or int8.

Stateflow Chart Exceptions

If you receive a message about consistency between the original subsystem and the S-function generated from the subsystem build, and the model contains a Stateflow chart that contains one or more Simulink functions, use the following procedure to address the issue:

Open the model and double-click the Stateflow chart that causes the issue.
The chart Stateflow Editor dialog box is displayed.
Right-click in this dialog box.
In the context-sensitive menu, select Properties.
The Chart dialog box is displayed.
In the Chart dialog box, navigate to the States When Enabling parameter and select Held.
Click Apply and OK and save the model.

Data Store Memory Block

To generate PLC code for a model that uses a Data Store Memory block, first define a Simulink.Signal object in the base workspace. Then, in the Signal Attributes tab of the block parameters, set the data store name to resolve to that Simulink.Signal object.

For more information, see Data Stores with Data Store Memory Blocks.

Reciprocal Sqrt Block

The Simulink PLC Coder software does not support the Simulink Reciprocal Sqrt block signedSqrt and rSqrt functions.

Lookup Table Blocks

Simulink PLC Coder has limited support for lookup table blocks. The coder does not support:

Number of dimensions greater than 2
Cubic spline interpolation method
Begin index search using a previous index mode
Cubic spline extrapolation method

Note

The Simulink PLC Coder software does not support the Simulink Lookup Table Dynamic block. For your convenience, the plclib/Simulink/Lookup Tables library contains an implementation of a dynamic table lookup block using the Prelookup and Interpolation Using Prelookup blocks.