From
Accept input from Goto block
Libraries:
Simulink /
Signal Routing
HDL Coder /
Signal Routing
Description
The From block accepts a signal from a corresponding Goto block, then passes it as output. The data type of the output is the same as that of the input from the Goto block. From and Goto blocks allow you to pass a signal from one block to another without actually connecting them.
For example, this model uses a Goto block and a From block.
An equivalent model passes the Sine Wave block signal directly to the Gain block.
A From block can receive its signal from only one Goto block, although a Goto block can pass its signal to more than one From block.
To associate a Goto block with a From block, enter the Goto block tag in the Goto Tag parameter.
The visibility of a Goto block tag determines the From blocks that can receive its signal. For more information, see Goto and Goto Tag Visibility. The block indicates the visibility of the Goto block tag:
A local tag name is enclosed in brackets (
[]).A scoped tag name is enclosed in braces (
{}).A global tag name appears without additional characters.
The From block supports signal label propagation. For more information, see Signal Label Propagation.
You can simplify your model diagrams by replacing lengthy signal lines with sets of connected Goto and From blocks. However, when you want to trace a signal path, it can be useful to see the signal lines. You can convert signal lines and virtual buses to Goto and From block sets, and you can convert Goto and From block sets to signal lines. For more information, see Convert Signal Lines to Goto and From Blocks and Vice Versa.
Examples
This example shows how to use the From, Goto, and Goto Tag Visibility blocks to route signals in your model. The GotoGlobal block at the top-level of the model has the Goto tag parameter set to G and the Tag visibility set to global. Thus, the G tag can be seen by From and Goto blocks at any level of the model hierarchy, except locations that span nonvirtual subsystem boundaries (like the Atomic Subsystem in this model). The From block at the top level of the model can see and connect to the global G tag, but cannot see or connect to the scoped S tag or L local tag that are specified on Goto blocks further down in the model hierarchy.
Inside of the Main Subsystem, the Goto block with Goto tag set to S has a Tag visibility of scoped. The Goto Tag Visibility block placed at the same level as that Goto block indicates the S tag can be seen by all From and Goto blocks at that level and below, except for locations that cross a nonvirtual subsystem boundary (i.e. the boundary with the Atomic Subsystem). Inside of Subsystem1 and Subsystem2, the From blocks can see and connect to the global Goto tag G, and the scoped Goto tag S.
Extended Examples
Simulating Automatic Climate Control Systems
Simulate an automatic climate control system in a car using Simulink® and Stateflow®.
Model Stick-Slip Friction and Hard Stops in Mass-Spring-Damper System
One way you can incorporate hard stops and friction changes from stick-slip motion into a mass-spring-damper model.
Building a Clutch Lock-Up Model
Use Simulink® to model and simulate a rotating clutch system. Although modeling a clutch system is difficult because of topological changes in the system dynamics during lockup, this example shows how enabled subsystem can easily handle such problems. We illustrate how to employ important Simulink modeling concepts in the creation of the clutch simulation. Designers can apply these concepts to many models with strong discontinuities and constraints that may change dynamically.
Ports
Output
Parameters
Specify the tag of the Goto block that forwards its signal to this From block. To change the tag, select a new tag from the drop-down list.
The drop-down list displays the Goto tags that the From
block can currently see. An item labeled <More
Tags...> appears at the end of the list the first time you
display the list in a Simulink® session. Selecting this item causes the block to update the
tags list to include the tags of Goto blocks residing in
library subsystems referenced by the model containing this
From block. Simulink software displays a progress bar while building the list of
library tags. Simulink saves the updated tags list for the duration of the
Simulink session or until the next time you select the adjacent
Update Tags button. You need to update the tags
list again in the current session only if the libraries referenced by the
model have changed since the last time you updated the list.
Tip
If you use multiple From and Goto Tag Visibility blocks to refer to the same Goto tag, you can simultaneously rename the tag in all of the blocks. To do so, use the Rename All button in the Goto block dialog box. Alternatively, when you change the tag on the Goto block icon, propagate the new name to all corresponding From and Goto Tag Visibility blocks by pressing Shift+Enter.
To find the relevant Goto block, use the Goto Source hyperlink in the From block dialog box.
Programmatic Use
Block Parameter:
GotoTag
|
| Type: character vector |
Values:
'A' | ...
|
Default:
'A'
|
Updates the list of tags visible to this From block, including tags residing in libraries referenced by the model containing this From block. Update the tags list again in the current session only if the libraries referenced by the model have changed since the last time you updated the list.
Path of the Goto block connected to this From block. Clicking the path displays and highlights the Goto block in your model.
In the Simulink Editor, selecting the From block highlights the corresponding Goto and Goto Tag Visibility blocks.
When a corresponding Goto or Goto Tag Visibility block is not in the current diagram, the Subsystem block that contains the block is highlighted.
To show a corresponding block in an open diagram or new tab, select the
From block and pause on the ellipsis. Then, select
Related Blocks
from the action bar. When multiple blocks
correspond to the selected block, a list of related blocks opens. You can
filter the list of related blocks by entering a search term in the text box.
After you select a related block from the list, window focus goes to the
open diagram or new tab that shows the related block.
Specifies the text to display on the From block icon. The options are the block tag, the name of the signal that the block represents, or both the tag and the signal name.
Programmatic Use
Block Parameter:
IconDisplay
|
| Type: character vector |
Values:
'Signal name' | 'Tag' | 'Tag and signal
name' |
Default:
'Tag'
|
Block Characteristics
Data Types |
|
Direct Feedthrough |
|
Multidimensional Signals |
|
Variable-Size Signals |
|
Zero-Crossing Detection |
|
