Enabled and Triggered Subsystem
Subsystem whose execution is enabled and triggered by external inputs
Libraries:
Simulink /
Ports & Subsystems
Description
The Enabled and Triggered Subsystem block is a Subsystem block preconfigured as a starting point for creating a subsystem that executes when both of these conditions occur:
Enable control signal has a positive value.
Trigger control signal has a trigger value.
Use Enabled and Triggered Subsystem blocks to model:
Optional functionality.
Alternative functionality.
Examples
Counters Using Conditionally Executed Subsystems
Implement counters using Enabled and Triggered subsystems. In this example, the model sldemo_counters controls flow of water into a tank and uses a counter to count the number of times overflow occurs, where overflow occurs when the water level in the tank is 8 meters or more for 30 seconds or more.
Ports
Input
In — Signal input to a subsystem block
scalar | vector | matrix
Placing an Inport block in a subsystem adds an external input port to the Subsystem block. The port label matches the name of the Inport block.
Use Inport blocks to get signals from the local environment.
Data Types: half
| single
| double
| int8
| int16
| int32
| int64
| uint8
| uint16
| uint32
| uint64
| Boolean
| fixed point
| enumerated
| bus
Enable — Control signal input to a subsystem block
scalar
Placing an Enable block in a subsystem adds an external input port to the Subsystem block.
Data Types: single
| double
| int8
| int16
| int32
| int64
| uint8
| uint16
| uint32
| uint64
| fixed point
Trigger — Control signal input to a subsystem block
scalar
Placing a Trigger block in a subsystem adds an external input port to the Subsystem block.
Data Types: single
| double
| int8
| int16
| int32
| int64
| uint8
| uint16
| uint32
| uint64
| fixed point
Output
Out — Signal output from a subsystem
scalar | vector | matrix
Placing an Outport block in a subsystem adds an output port from the Subsystem block. The port label on the subsystem block is the name of the Outport block.
Use Outport blocks to send signals to the local environment.
Data Types: half
| single
| double
| int8
| int16
| int32
| int64
| uint8
| uint16
| uint32
| uint64
| Boolean
| fixed point
| enumerated
| bus
Parameters
To edit block parameters interactively, use the Property Inspector. From the Simulink® Toolstrip, on the Simulation tab, in the Prepare gallery, select Property Inspector.
Main
Show port labels — Display options for port labels
FromPortIcon
(default) | FromPortBlockName
| SignalName
| none
Select how to display port labels on the Subsystem block icon.
none
— Do not display port labels.FromPortIcon
— If the corresponding port icon displays a signal name, display the signal name on the Subsystem block. Otherwise, display the port block name or the port number if the block name is a default name.FromPortBlockName
— Display the name of the corresponding port block on the Subsystem block.SignalName
— If the signal connected to the port is named, display the name of the signal on the Subsystem block. Otherwise, display the name of the corresponding port block.
For port label editing on Subsystem blocks, see Edit Port Labels on Subsystem Blocks.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | ShowPortLabels |
Values: | 'FromPortIcon' (default) | 'FromPortBlockName' | 'SignalName' | 'none' |
Read/Write permissions — Levels of access to contents of subsystem
ReadWrite
(default) | ReadOnly
| NoReadOrWrite
Control user access to the contents of the subsystem.
ReadWrite
— Enable opening and modification of subsystem contents.ReadOnly
— Enable opening but not modification of the subsystem. If the subsystem resides in a block library, you can create and open links to the subsystem and can make and modify local copies of the subsystem but cannot change the permissions or modify the contents of the original library instance.NoReadOrWrite
— Disable opening or modification of subsystem. If the subsystem resides in a library, you can create links to the subsystem in a model but cannot open, modify, change permissions, or create local copies of the subsystem.
You do not receive a response if you attempt to view the contents of a subsystem whose Read/Write permissions parameter is set to NoReadOrWrite
. For example, when double-clicking such a subsystem, the software does not open the subsystem and does not display any messages.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | Permissions |
Values: | 'ReadWrite' (default) | 'ReadOnly' | 'NoReadOrWrite' |
Name of error callback function — Name of function to be called if error occurs
no default
Enter the name of a function to be called if an error occurs while the software executes the subsystem.
The software passes two arguments to the function: the handle of the subsystem and a character vector that specifies the error type. If no function is specified, the software displays a generic error message if executing the subsystem causes an error.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | ErrorFcn |
Values: | '' (default) | function name in quotes |
Data Types: | char | string |
Permit hierarchical resolution — Resolution for workspace variable names
All
(default) | ExplicitOnly
| None
Select whether to resolve names of workspace variables referenced by this subsystem.
For more information, see Symbol Resolution and Symbol Resolution Process.
All
— Resolve all names of workspace variables used by this subsystem, including those used to specify block parameter values and Simulink data objects (for example,Simulink.Signal
objects).ExplicitOnly
— Resolve only names of workspace variables used to specify block parameter values, data store memory (where no block exists), signals, and states marked as “must resolve”.None
— Do not resolve any workspace variable names.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | PermitHierarchicalResolution |
Values: | 'All' (default) | 'ExplicitOnly' | 'None' |
Show subsystem reinitialize ports — Option to display reinitialize event ports
off
(default) | on
Select this parameter to display the reinitialize event ports. Clear this parameter to remove the ports.
Dependencies
To enable this parameter, select Treat as atomic unit.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | ShowSubsystemReinitializePorts |
Values: | 'off' (default) | 'on' |
Minimize algebraic loop occurrences — Option to eliminate artificial algebraic loops
off
(default) | on
Try to eliminate any artificial algebraic loops that include the atomic subsystem
off
— Do not try to eliminate any artificial algebraic loops that include the atomic subsystem.on
— Try to eliminate any artificial algebraic loops that include the atomic subsystem.
Dependencies
To enable this parameter, select Treat as atomic unit.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | MinAlgLoopOccurrences |
Values: | 'off' (default) | 'on' |
Code Generation
Parameters on the Code Generation tab require a Simulink Coder™ or Embedded Coder® license.
Function packaging — Code format
Auto
| Inline
| Nonreusable function
| Reusable function
Select the code format to be generated for an atomic (nonvirtual) subsystem.
Auto
— The software chooses the optimal format for you based on the type and number of instances of the subsystem that exist in the model.Inline
— The software inlines the subsystem unconditionally.Nonreusable function
— If Filename options is set toAuto
, the software packages separate functions in the model file. If File name options is set toUse subsystem name
,Use function name
, orUser specified
using different filenames, the software packages separate functions in separate files.Subsystems with this setting generate functions that might have arguments depending on the Function interface parameter setting. You can name the generated function and file using parameters Function name and File name (no extension), respectively. These functions are not reentrant.
Reusable function
— The software generates a function with arguments that allows reuse of subsystem code when a model includes multiple instances of the subsystem.This option also generates a function with arguments that allows subsystem code to be reused in the generated code of a model reference hierarchy that includes multiple instances of a subsystem across referenced models. In this case, the subsystem must be in a library.
For more information, see:
Generate Code and Executables for Individual Subsystems (Simulink Coder)
Generate Inlined Subsystem Code (Simulink Coder)
Generate Subsystem Code as Separate Function and Files (Simulink Coder)
Generate Reusable Code from Library Subsystems Shared Across Models (Simulink Coder)
The default value depends on the block configuration. For example, the default
value for the Subsystem block is Auto
.
The default value for the CodeReuseSubsystem block is
Reusable function
.
Tips
When you want multiple instances of a subsystem to be represented as one reusable function, you can designate each one of them as
Auto
or asReusable function
. Using one or the other is best, as using both creates two reusable functions, one for each designation. The outcomes of these choices differ only when reuse is not possible. SelectingAuto
does not allow control of the function or filename for the subsystem code.The
Reusable function
andAuto
options both try to determine if multiple instances of a subsystem exist and if the code can be reused. The difference between the behavior of each option is that when reuse is not possible:Auto
yields inlined code, or if circumstances prohibit inlining, separate functions for each subsystem instance.Reusable function
yields a separate function with arguments for each subsystem instance in the model.
If you select
Reusable function
while your generated code is under source control, set File name options toUse subsystem name
,Use function name
, orUser specified
. Otherwise, the names of your code files change whenever you modify your model, which prevents source control on your files.If you select an option other than
Auto
orInline
and the model configuration parameter States, the code generator produces separate output and update methods. The code generator does not take into account the Combine output and update methods for code generation and simulation specification.
Dependencies
This parameter requires a Simulink Coder license for code generation.
To enable this parameter, select Treat as atomic unit.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | RTWSystemCode |
Values: | 'Auto' | 'Inline' | 'Nonreusable function' | 'Reusable function' |
Function name options — How to name generated function
Auto
| Use subsystem name
| User specified
Select how the software names the function it generates for the subsystem.
If you have an Embedded Coder license, you can control function names with options on the Configuration Parameter Code Generation > Identifiers pane.
Auto
— Assign a unique function name using the default naming convention,
, wheremodel
_subsystem
()model
is the name of the model andsubsystem
is the name of the subsystem, or that of an identical one when code is being reused.If you select
Reusable function
for the Function packaging parameter and a model reference hierarchy contains multiple instances of the reusable subsystem, in order to generate reusable code for the subsystem, Function name options must be set toAuto
.Use subsystem name
— Use the subsystem name as the function name. By default, the function name uses the naming convention
.model
_subsystem
When a subsystem is in a library block and the subsystem parameter Function packaging is set to
Reusable function
, if you set theUse subsystem name
option, the code generator uses the name of the library block for the subsystem function name and filename.User specified
— Enable the Function name field. Enter any legal C or C++ function name, which must be unique.
For more information, see Generate Subsystem Code as Separate Function and Files (Simulink Coder).
The default value depends on the block configuration. For example, the default
value for the Subsystem block is Auto
.
The default value for the CodeReuseSubsystem block is
Use subsystem name
.
Dependencies
This parameter requires a Simulink Coder license.
To enable this parameter, set Function packaging to
Nonreusable function
orReusable function
.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | RTWFcnNameOpts |
Values: | 'Auto' | 'Use subsystem name' | 'User specified' |
Function name — Name of function for subsystem code
no default
Specify a unique, valid C or C++ function name for subsystem code.
Use this parameter if you want to give the function a specific name instead of allowing the Simulink Coder code generator to assign its own autogenerated name or use the subsystem name. For more information, see Generate Subsystem Code as Separate Function and Files (Simulink Coder).
Dependencies
This parameter requires a Simulink Coder license.
To enable this parameter, set Function name options to
User specified
.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | RTWFcnName |
Values: | '' (default) | function name in quotes |
Data Types: | char | string |
File name options — How to name generated file
Auto
| Use subsystem name
| Use function name
| User specified
Select how the software names the separate file for the function it generates for the subsystem.
Auto
— Depending on the configuration of the subsystem and how many instances are in the model,Auto
yields different results.If the code generator does not generate a separate file for the subsystem, the subsystem code is generated within the code module generated from the subsystem parent system. If the subsystem parent is the model itself, the subsystem code is generated within
ormodel
.c
.model
.cppIf you select
Reusable function
for the Function packaging parameter and your generated code is under source control, consider specifying a File name options value other thanAuto
. This prevents the generated filename from changing due to unrelated model modifications, which is problematic for using source control to manage configurations.If you select
Reusable function
for the Function packaging parameter and a model reference hierarchy contains multiple instances of the reusable subsystem, in order to generate reusable code for the subsystem, File name options must be set toAuto
.
Use subsystem name
— The code generator generates a separate file, using the subsystem (or library block) name as the filename.When File name options is set to
Use subsystem name
, the subsystem filename is mangled if the model contains Model blocks, or if a model reference target is being generated for the model. In these situations, the filename for the subsystem consists of the subsystem name prefixed by the model name.Use function name
— The code generator uses the function name specified by Function name options as the filename.User specified
— This option enables the File name (no extension) text entry field. The code generator uses the name you enter as the filename. Enter any filename, but do not include the.c
or.cpp
(or any other) extension. This filename need not be unique.While a subsystem source filename need not be unique, you must avoid giving nonunique names that result in cyclic dependencies. For example,
sys_a.h
includessys_b.h
,sys_b.h
includessys_c.h
, andsys_c.h
includessys_a.h
.
The default value depends on the block configuration. For example, the default
value for the Subsystem block is Auto
.
The default value for the CodeReuseSubsystem block is
Use function name
.
Dependencies
This parameter requires a Simulink Coder license.
To enable this parameter, set Function packaging to
Nonreusable function
orReusable function
.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | RTWFileNameOpts |
Values: | 'Auto' | 'Use subsystem name' | 'Use function name' | 'User specified' |
File name (no extension) — Name of generated file
no default
The filename that you specify does not have to be unique. However, avoid giving
non-unique names that result in cyclic dependencies. For example,
sys_a.h
includes sys_b.h
,
sys_b.h
includes sys_c.h
, and
sys_c.h
includes sys_a.h
.
For more information, see Generate Subsystem Code as Separate Function and Files (Simulink Coder).
Dependencies
This parameter requires a Simulink Coder license.
To enable this parameter, set File name options to
User specified
.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | RTWFileName |
Values: | '' (default) | filename in quotes |
Data Types: | char | string |
Function interface — How to use arguments with generated function
void_void
(default) | Allow arguments (Optimized)
| Allow arguments (Match graphical interface)
Select how to use arguments with the generated function.
void_void
— Generate a function without arguments and pass data as global variables. For example:void subsystem_function(void)
Allow arguments (Optimized)
— Generate a function that uses arguments instead of passing data as global variables. This specification reduces global RAM. This option might reduce code size and improve execution speed and enable the code generator to apply additional optimizations. For example:void subsystem_function(real_T rtu_In1, real_T rtu_In2, real_T *rty_Out1)
In some cases, when generating optimized code, the code generator might not generate a function that has arguments.
Allow arguments (Match graphical interface)
— Generate a function interface that uses arguments that match the Subsystem graphical block interface. The generated function interface is predictable and does not change. A predictable interface can be useful for debugging and testing your code and integrating with external applications. For example, if a model has two Inport blocks and two Outport blocks, then the generated function interface is:void subsystem_function(real_T rtu_In1, real_T rtu_In2, real_T *rty_Out1, real_T *rty_Out2)
For more information, see:
Reduce Global Variables in Nonreusable Subsystem Functions (Embedded Coder)
Generate Predictable Function Interface to Match Graphical Block Interface (Embedded Coder)
Generate Modular Function Code for Nonvirtual Subsystems (Embedded Coder)
Dependencies
This parameter requires an Embedded Coder license and an ERT-based system target file.
To enable this parameter, set Function packaging to
Nonreusable function
.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | FunctionInterfaceSpec |
Values: | 'void_void' (default) | 'Allow arguments (Optimized)' | 'Allow arguments (Match graphical interface)' |
Function with separate data — Control code generation for subsystem
off
(default) | on
Generate subsystem function code in which the internal data for an atomic subsystem is separated from its parent model and is owned by the subsystem.
off
— Do not generate subsystem function code in which the internal data for an atomic subsystem is separated from its parent model and is owned by the subsystem.on
— Generate subsystem function code in which the internal data for an atomic subsystem is separated from its parent model and is owned by the subsystem. The subsystem data structure is declared independently from the parent model data structures. A subsystem with separate data has its own block I/O andDWork
data structure. As a result, the generated code for the subsystem is easier to trace and test. The data separation also tends to reduce the maximum size of global data structures throughout the model, because they are split into multiple data structures.
For details on how to generate modular function code for an atomic subsystem, see Generate Modular Function Code for Nonvirtual Subsystems (Embedded Coder).
For details on how to apply memory sections to atomic subsystems, see Override Default Memory Placement for Subsystem Functions and Data (Embedded Coder).
Dependencies
This parameter requires an Embedded Coder license and an ERT-based system target file.
To enable this parameter, set Function packaging to
Nonreusable function
.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | FunctionWithSeparateData |
Values: | 'off' (default) | 'on' |
Memory section for initialize/terminate functions — How to apply memory sections
Inherit from model
(default) | Default
| model memory
section
Select how the software applies memory sections to the subsystem initialization and termination functions.
Inherit from model
— Apply the root model memory sections to the subsystem function code.Default
— Do not apply memory sections to the subsystem system code, overriding any model-level specification.Apply one of the model memory sections to the subsystem.
Tips
The possible values vary depending on what, if any, package of memory sections you have set for the model configuration. See Control Data and Function Placement in Memory by Inserting Pragmas (Embedded Coder) and Model Configuration Parameters: Code Generation (Simulink Coder).
If you have not configured the model with a package,
Inherit from model
is the only available value. Otherwise, the list includesDefault
and all memory sections the model package contains.These options can be useful for overriding the model memory section settings for the given subsystem. For details on how to apply memory sections to atomic subsystems, see Override Default Memory Placement for Subsystem Functions and Data (Embedded Coder).
Dependencies
This parameter requires an Embedded Coder license and an ERT-based system target file.
To enable this parameter, set Function packaging to
Nonreusable function
orReusable function
.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | RTWMemSecFuncInitTerm |
Values: | 'Inherit from model' (default) | 'Default' | model memory section in quotes |
Memory section for execution functions — How to apply memory sections
Inherit from model
(default) | Default
| model memory section
Select how Embedded Coder applies memory sections to the subsystem execution functions.
Inherit from model
— Apply the root model memory sections to the subsystem function code.Default
— Do not apply memory sections to the subsystem system code, overriding any model-level specification.Apply one of the model memory sections to the subsystem.
Tips
The possible values vary depending on what, if any, package of memory sections you have set for the model configuration. See Control Data and Function Placement in Memory by Inserting Pragmas (Embedded Coder) and Model Configuration Parameters: Code Generation (Simulink Coder).
If you have not configured the model with a package,
Inherit from model
is the only available value. Otherwise, the list includesDefault
and all memory sections the model package contains.These options can be useful for overriding the model memory section settings for the given subsystem. For details on how to apply memory sections to atomic subsystems, see Override Default Memory Placement for Subsystem Functions and Data (Embedded Coder).
Dependencies
This parameter requires an Embedded Coder license and an ERT-based system target file.
To enable this parameter, set Function packaging to
Nonreusable function
orReusable function
.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | RTWMemSecFuncExecute |
Values: | 'Inherit from model' (default) | 'Default' | model memory section in quotes |
Memory section for constants — How to apply memory sections
Inherit from model
(default) | Default
| model memory section
Select how the software applies memory sections to the subsystem constants.
Inherit from model
— Apply the root model memory sections to the subsystem data.Default
— Do not apply memory sections to the subsystem data, overriding any model-level specification.Apply one of the model memory sections to the subsystem.
Tips
The memory section that you specify applies to the corresponding global data structures in the generated code. For basic information about the global data structures generated for atomic subsystems, see Standard Data Structures (Simulink Coder).
The possible values vary depending on what, if any, package of memory sections you have set for the model configuration. See Control Data and Function Placement in Memory by Inserting Pragmas (Embedded Coder).
If you have not configured the model with a package,
Inherit from model
is the only available value. Otherwise, the list includesDefault
and all memory sections the model package contains.These options can be useful for overriding the model memory section settings for the given subsystem. For details on how to apply memory sections to atomic subsystems, see Override Default Memory Placement for Subsystem Functions and Data (Embedded Coder).
Dependencies
This parameter requires an Embedded Coder license and an ERT-based system target file.
To enable this parameter, set Function packaging to
Nonreusable function
and select the Function with separate data parameter.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | RTWMemSecDataConstants |
Values: | 'Inherit from model' (default) | 'Default' | model memory section in quotes |
Memory section for internal data — How to apply memory sections
Inherit from model
(default) | Default
| model memory section
Select how the software applies memory sections to the subsystem internal data.
Inherit from model
— Apply the root model memory sections to the subsystem data.Default
— Do not apply memory sections to the subsystem data, overriding any model-level specification.Apply one of the model memory sections to the subsystem.
Tips
The memory section that you specify applies to the corresponding global data structures in the generated code. For basic information about the global data structures generated for atomic subsystems, see Standard Data Structures (Simulink Coder).
The possible values vary depending on what, if any, package of memory sections you have set for the model configuration. See Control Data and Function Placement in Memory by Inserting Pragmas (Embedded Coder).
If you have not configured the model with a package,
Inherit from model
is the only available value. Otherwise, the list includesDefault
and all memory sections the model package contains.These options can be useful for overriding the model memory section settings for the given subsystem. For details on how to apply memory sections to atomic subsystems, see Override Default Memory Placement for Subsystem Functions and Data (Embedded Coder).
Dependencies
This parameter requires an Embedded Coder license and an ERT-based system target file.
To enable this parameter, set Function packaging to
Nonreusable function
and select the Function with separate data parameter.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | RTWMemSecDataInternal |
Values: | 'Inherit from model' (default) | 'Default' | model memory section in quotes |
Memory section for parameters — How to apply memory sections
Inherit from model
(default) | Default
| model memory section
Select how the software applies memory sections to the subsystem parameters.
Inherit from model
— Apply the root model memory sections to the subsystem function code.Default
— Do not apply memory sections to the subsystem system code, overriding any model-level specification.Apply one of the model memory sections to the subsystem.
Tips
The memory section that you specify applies to the corresponding global data structure in the generated code. For basic information about the global data structures generated for atomic subsystems, see Standard Data Structures (Simulink Coder).
The possible values vary depending on what, if any, package of memory sections you have set for the model configuration. See Control Data and Function Placement in Memory by Inserting Pragmas (Embedded Coder).
If you have not configured the model with a package,
Inherit from model
is the only available value. Otherwise, the list includesDefault
and all memory sections the model package contains.These options can be useful for overriding the model memory section settings for the given subsystem. For details on how to apply memory sections to atomic subsystems, see Override Default Memory Placement for Subsystem Functions and Data (Embedded Coder).
Dependencies
This parameter requires an Embedded Coder license and an ERT-based system target file.
To enable this parameter, set Function packaging to
Nonreusable function
and select the Function with separate data parameter.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | RTWMemSecDataParameters |
Values: | 'Inherit from model' (default) | 'Default' | model memory section in quotes |
Subsystem Reference
Subsystem file name — Filename of referenced subsystem
no default
Specify the subsystem file you want to reference. For information about subsystem references, see Create and Use Referenced Subsystems in Models.
Dependencies
To access this parameter, in the Subsystem Reference section, click Convert.
For more information on how to convert a subsystem to a referenced subsystem, see Convert Subsystem to a Referenced Subsystem.
Programmatic Use
To set the block parameter value programmatically, use
the set_param
function.
Parameter: | ReferencedSubsystem |
Values: | '' (default) | subsystem filename in quotes |
Data Types: | char | string |
Block Characteristics
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.
Actual code generation support depends on block implementation.
Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.
Actual data type support depends on block implementation.
Version History
Introduced before R2006a
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