Data exchange (Tc Interfaces)
Configuration in Simulink
Depending on the Simulink model, there are several groups of internal variables in addition to the input and output variables. ADS access and the process image type can be configured as required. These settings affect how the variables are linked with other process images in the TwinCAT development environment, and how they can exchange data. The following groups can be configured:
Group | Description |
|---|---|
Input | Model inputs |
Output | Model outputs |
Parameter | Model-specific parameters: Parameters of Simulink blocks that can be "set" |
BlockIO | Global output signals of Simulink blocks: Internal signals for which a "test point" was set or which were declared as global due to code optimizations of the code generator. |
ContState | Continuous state variables |
DWork | Time-discrete state variables |
On the configuration page TC Interface in the coder settings, there are several possible settings for each of these variable groups. The options available for selection depend on the group, i.e. not all the described options are available in all cases:
Parameter | Options | |
|---|---|---|
GROUP access (checkbox) | TRUE | The module enables access to variables of this group. |
FALSE | The module denies access to variables of this group. | |
ADS access | Only relevant if "GROUP access"=TRUE | |
No ADS access | No ADS access | |
ReadOnly_NoSymbols | No ADS write access, ADS communication is only possible via the Index group and the Index Offset information | |
ReadWrite_NoSymbols | Full ADS access, ADS communication is only possible via the Index group and the Index Offset information | |
ReadOnly_CreateSymbols | No ADS write access, ADS symbol information is generated | |
ReadWrite_CreateSymbols | Full ADS access, ADS symbol information is generated | |
Process image | Only relevant if "GROUP access"=TRUE | |
No DataArea | Link to DataArea or I/O: no Link to DataPointer: no | |
Standard DataArea | Link to DataArea or I/O: no Link to DataPointer: yes | |
Input-Destination DataArea | Link to DataArea or I/O: yes Link to DataPointer: yes | |
Output-Source DataArea | Link to DataArea or I/O: yes Link to DataPointer: yes | |
Internal DataArea | Link to DataArea or I/O: no Link to DataPointer: no | |
Retain DataArea | Enables linking to a "retain handler" (see retain data) for remanent data management. | |
The above setting options can be realized in the following mask via the corresponding drop-down lists.
The restore default settings option can be used to undo all changes and reset the default settings. The default settings are shown in the diagram above.