.. _channel_selection_changed:

Channel Selection Changed
================================

If you are using Simulink library files to manage different components of your
software, then you may encounter instances where the channel selection in
OpenECU I/O blocks changes. The OpenECU blocks initialize when a model is
loaded to display I/O channels for the selected target. The initialization
code identifies the target by searching the model for a **Model
Identification** block.

- If the block is found, the target is identified, and the I/O options are
  narrowed to that specific target.
- If not, the target is undetermined, and all I/O options are displayed.

There are two ways to mitigate this:

1. Keep as many OpenECU blocks in the master model as possible, limiting
   library models to Simulink blocks.

2. Include a **Model Identification** block at the top level of each library
   model, configured with the master model's target.

**Notes**:

- Channel selection usually defaults to the first option, possibly causing
  duplication errors.

- Channel options may also change when switching target ECUs or upgrading
  OpenECU versions. MATLAB usually prints a warning.